Technical field
[0001]
　The present invention, bonding between the metal and the resin member, the bonding between the carbon fiber-reinforced resin member and the resin member, relates to joining of the metal and carbon fiber reinforced resin member through the intermediate member made of a resin, in particular, increase the welding speed and it is possible to obtain a joining member having a bonding strength can, to and excellent joining them by relates bonding method.
Background technique
[0002]
　In recent years, in the field of automobile, CO 2 from a stream of body weight to achieve emission limits, while ensuring the strength and rigidity, it is required that the weight of the parts. Such order to satisfy the request, a portion of the member which has been using the conventional metal instead of resin, adoption of parts joining the metal and resin member is advanced gradually. In particular, carbon fiber reinforced resin composite of resin and carbon fibers (hereinafter sometimes referred to as "CFRP") development proceeds in while ensuring strength and rigidity, in that it can reduce the weight of the parts is larger expected . Therefore, the junction part between the resin member and the CFRP member, etc., are also desired further components formed by joining a resin such as a metal and CFRP. These joint products, it is considered that use in the field of automobiles, it is high production efficiency, for example, welding speed and yield is also required high.
[0003]
　In general, metals are difficult to bond to the resin is not limited to CFRP. Among them, as a method of bonding a metal and a resin member, a method of bonding using an adhesive or the like, a method of fixing both to provide a fixing member to at least one of a metal and a resin member, with screws or the like mechanical method for joining, a method of joining by forming minute irregularities on the bonding surface of the metal side an anchor effect, and a method of bonding by irradiating a laser beam on at least one of a metal and a resin member.
[0004]
　Adhesive, fixing member, or a method of joining using screws or the like, it is necessary material for joining to other metals and resin member. However, the improvement of economical efficiency and recyclability, a method for bonding a metal and a resin member directly is preferable. Further, a method of bonding by forming minute irregularities on the bonding surface of the metal side is advantageous in that it does not use a material for bonding such as an adhesive, in addition to the bonding step, necessary irregularities forming step next, there is room for improvement in the improvement of productivity. In contrast, in the method of bonding using a laser and a metal and a resin member, the material for bonding such as an adhesive is not necessary, the processing of the joint surface of the metal is not required. A method of bonding a metal and a resin using a laser, a technique for bonding with high bonding strength as follows has been proposed.
[0005]
　Patent Document 1 discloses a metal-resin joint using a laser light source, a technique in combination with a laser light source and a laser light source resin decomposed resin melt is disclosed. In this technique, heating the resin joint with a single laser light source, when it is not possible to uniformly control the power density distribution, a large bubble or the evaporation zone to the laser irradiation unit is generated, a wide range by a laser light source for resin melt the resin was preliminarily melted, by irradiating a laser light source for resin decomposed in a narrow place molten resin to decompose the resin is configured to generate a joint having a high bonding strength to a desired location.
[0006]
　Further, Patent Document 2, the bonding surface of the resin and the metal to a method for joining by laser irradiation, with pressurized by a resin and a metal from the metal side pressure 圧材, pressurized 圧材 light absorptance greater and things, and laser irradiation to the pressure 圧材, by heat conduction to the resin through the metal from a pressurized 圧材, a technique for joining a resin and a metal, a high strength and uniform is disclosed.
[0007]
　In Patent Document 3, when the laser bonding between the thermoplastic resin and the metal, since the resin is peeled off by thermal stress, there is not favorable bond is obtained, pressurizing the upper portion of the joint portion of glass or the like it is disclosed that it is preferable that pressure.
[0008]
　Further, Patent Document 4, when the laser joining two workpieces, the junction of each of the workpieces by pressurizing compacted wear axis of rotation laser transmitting, by suppressing technology disclosed warpage or distortion of the workpiece there.
[0009]
　In the junction between the resin member and the CFRP member, adhesive welding, vibration welding, ultrasonic welding, friction welding, hot plate welding technology, etc. have been used, for example, Patent Document 5, with a friction welding technique, in Patent Document 6, using a hot plate welding technology, it has been reported that for joining resin members and CFRP member.
[0010]
　In the junction between the metal and the CFRP member, a method of bonding using an adhesive or the like, a method of mechanical bonding with bolt or the like, a method in which by forming minute irregularities on the bonding surface of the metal side joining an anchor effect there (see Patent Document 7, 8).
[0011]
　In contrast, in the technique for joining metal and CFRP member, (see Non-Patent Document 1) techniques have been reported for joining the members together by a laser beam.
CITATION
Patent Literature
[0012]
Patent Document 1: JP 2008-213156 Patent Publication
Patent Document 2: JP 2013-216028 Patent Publication
Patent Document 3: JP 2012-56308 JP
Patent Document 4: Japanese Patent 5305003 Patent Publication
Patent Document 5: JP-T 2010-516494 JP
Patent Document 6: JP 2015-131394 Patent Publication
Patent Document 7: JP 2011-073191 JP
Patent Document 8: JP-A 06-101732 JP
Non-Patent Document
[0013]
Non-Patent Document 1: Katayama St. Second, he was two, Welding Society National Conference Lecture Summary, Vol. 86, 2010
Non-Patent Document 2: three bottles and a long, Ritz-ーza Processing Society of, Vol. 14, No. 4, in 2007, p. 211-215
Non-Patent Document 3: Akihiko Tsuboi, Welding Technology, Vol. 53, in 2005, p. 129-133
Summary of the Invention
Problems that the Invention is to Solve
[0014]
　Regard bonding of metal and resin, the technique disclosed in Patent Document 1, it is possible to control the heating location and the heating temperature of the resin easily and efficiently, high strength, it is possible to form a uniform metal-resin joint , at the junction of the metal and a resin, is an effective technique, in the embodiment, welding speed is 0.3 m / min, to actually use the, there is room for improvement in the improvement of welding speed.
　Patent Document 2 discloses the technology is not dependent on the light absorption of the metal, for the high strength and homogeneous resin and metal can be laser bonded, is an effective technique, no mention or suggest the welding speed.
　The technique disclosed in Patent Document 3, welding speed is 5 mm / s, the production efficiency is not sufficiently high. In Patent Document 4, there is no suggestion described welding speed.
[0015]
　Regard bonding between the resin member and the CFRP member, adhesive welding, vibration welding, ultrasonic welding, friction welding, hot plate welding technique or the like is used. (See Patent Documents 5 and 6)
　However, in the adhesive art, it is necessary drying and curing time, also, the environmental impact of problems such as dispersion gas in an organic solvent has been pointed out, vibration welding, ultrasonic welding, in the friction welding technology, the problem of product damage has been pointed out by the vibration. Further, in the hot plate welding technology, adhesion time is suitable for short production, although less vibration damage, for contacting the workpieces to the hot plate directly, when removing the hot plate, the molten resin is hot plate there is a problem that the stringing phenomenon occurs adhered to.
[0016]
　On the other hand, although not disclosed in Patent Documents 5 and 6, it laser beam welding techniques for joining resin each other in the laser light, abrasion powder and burrs are not in a non-contact, less product damage due to vibration and from, it has been attracting attention recently.
[0017]
　For example, Non-Patent Documents 2 and 3, as a transparent member while the laser light passes through the bonding to the resin member, as an absorption member for absorbing the laser beam and the other (e.g., kneaded resin member and carbon black), superposing both members, is irradiated with a laser beam from the transparent member side, the absorbent member to melt, be joined is disclosed.
[0018]
　Accordingly, the present inventors have found that in joining of the resin member and the CFRP member was attempted using a laser beam welding techniques. Specifically, a resin member that transmits a laser beam, superposing the CFRP member that absorbs a laser beam, in order to shorten the time required for bonding, to increase the output of the laser, the laser beam from the resin member side It was irradiated, the resin member is volatilized, the volatile resin component that interferes with the laser beam, the laser power is lost, it was not possible to obtain a joining member having a strength of aim.
[0019]
　Regard bonding between the metal and the CFRP member, a method of bonding using an adhesive or the like, a method of mechanical bonding with bolt or the like, a method in which by forming minute irregularities on the bonding surface of the metal side joining an anchor effect disclosed (Patent documents 7 and 8). However, as described above, the method using an adhesive agent by the adhesive, it is necessary drying and curing time, also, the environmental impact of problems such as dispersion gas in an organic solvent has been pointed out. In the method of mechanical bonding, requires fixing member, the improvement of economical efficiency and recyclability, a method of bonding a metal and a CFRP member directly is preferable. In the method of joining an anchor effect, in addition to the bonding step, a step of forming irregularities on the bonding surface is required, there is room for improvement in enhancement of productivity.
[0020]
　The technique disclosed in Non-Patent Document 1 is an effective technique in the bonding between the metal and the CFRP member, welding speed is 5mm / s (0.3m / min), in order to practical use of the welding speed there is room for improvement in the improvement. Therefore, in order to improve the bonding speed was subjected to bonding to enhance the output of the laser, there is a sufficient bonding strength can not be obtained.
[0021]
　The present invention relates to a method for joining light of these circumstances, a method of bonding a metal and a resin member, a method of bonding the CFRP member and a resin member and a metal and CFRP member through the resin member, in particular, bonding a faster speed can joining them, and to provide a and excellent joining method capable of obtaining a joining member having a bonding strength.
Means for Solving the Problems
[0022]
　The present inventors have intensively studied how to solve the above problems. Metal and resin member, CFRP member and the resin member through a resin member in order to bond the metal and CFRP member at high speed, tried to by increasing the output of the laser, it joined. However, the higher output increased volatilization amount of the resin, because the laser power is lost due to interference volatilized resin component and the laser beam, the junction becomes insufficient, it becomes having no strength aim.
[0023]
　Accordingly, the present inventors have, upon joining of the resin member and a metal or resin member and CFRP member and the resin member, and arranged to overlap the glass irradiation side of the laser beam of the resin member, through the glass from the resin side was irradiated with laser light, volatile resin component is discharged to the outside of the optical path of the laser beam, without the laser power is lost, it found that can be joined. The present inventors have found that the joint member having the strength aimed at high speed can be obtained.
[0024]
　Further, upon joining the metal and CFRP member was conceived by interposing an intermediate member made of a resin as an adhesive layer between the metal and the CFRP member (hereinafter, simply also this called "intermediate member").
[0025]
　First, at the junction between the CFRP member and the intermediate member, and arranged to overlap the glass irradiation side of the laser beam of the intermediate member was irradiated with laser light through the glass from the intermediate member side. As a result, by the irradiation of laser light, volatile resin component is discharged to the outside of the optical path of the laser beam, even when an increased output of the laser beam (if high speed bonding), and found that sufficient bonding.
[0026]
　Then, overlapped metal CFRP member intermediate member is joined, to increase the output of the laser was subjected to bonding by irradiating the laser beam from the metal side of the metal and the CFRP member having a sufficient bonding strength It found that the bonding member is obtained.
[0027]
　Further, when the bonding between the metal and the CFRP member, the CFRP member, the intermediate member and the metal made of resin, arranged superposed in this order, it was irradiated with laser light from the metal side. As a result, the laser light irradiation of a single pass only, metal is heated by the melting of the intermediate member due to propagation of the generated heat has been found that metal and CRPF member are joined via an intermediate member.
[0028]
　The present invention has been made based on the above findings, and its gist is as follows.
(1) In the joining method of superposing a metal and a resin member joining the resin member side is irradiated with a laser beam, the metal, the resin member and the glass where the laser beam is transmitted, superimposed in this order, said resin member side through the glass the laser beam is irradiated to the superimposed joint of the metal and the resin member, characterized in that joining by welding speed 0.5 m ~ 5.0 m / min method for joining metal and resin member.

(2) The joining method of joining by irradiating a laser beam from the resin member side superimposed and carbon fiber reinforced resin member and the resin member,
　the carbon fiber reinforced resin member, the resin member and the glass laser light is transmitted and the order in superposition, by irradiating the laser light through the glass from the resin member side superimposed joint of the resin member and the carbon fiber reinforced plastic member, welding speed 0.5 m ~ 5 method of joining carbon fiber reinforced resin member and the resin member, characterized in that bonding at .0m / min.

(3) The method via an intermediate member made of a resin to bond the metal and carbon fiber-reinforced resin member is irradiated with a laser beam,
　and said intermediate member to which the carbon-fiber-reinforced resin member and the laser beam is made of a resin which transmits joining, then, which joins the said with the intermediate member of metal,
　when the bonding between the intermediate member and the carbon fiber reinforced plastic member, the carbon fiber reinforced plastic member, the intermediate member and the glass , superimposed in this order, the from the intermediate member side through the glass laser beam is irradiated to the superimposed joint of the carbon fiber reinforced resin member and the intermediate member, welding speed 0.5 m ~ 5.0 m It joined in / min,
　Wherein when the intermediate member of the joint of the metal, the the surface of the intermediate member, superposing the metal, by heating the metal by irradiating a laser beam to the metal surface of the joint, welding speed 0.5 m ~ 5 It joined with .0m / min
joining method of the metal and carbon fiber reinforced resin member through the intermediate member, characterized in that.

(4)
　In the method for joining by laser beam irradiation and through an intermediate member made of a resin-metal and carbon fiber reinforced resin member pass only,
　the carbon fiber reinforced plastic member, said metal and said intermediate member, the order superposition, the laser light from the metal side by irradiating the superimposed joint of the metal and the carbon fiber reinforced resin member and the intermediate member, to pass joined by welding speed 0.5 m ~ 5.0 m / min
method of joining the metal and carbon fiber reinforced resin member through the intermediate member, characterized in that.
Effect of the invention
[0029]
　According to a first aspect of the present invention, a metal, superimposing the resin member and the glass, since the bonding of the resin member side is irradiated with a laser beam, interference between the vaporized resin component and the laser beam can be suppressed , it is possible to bond the metal and the resin member at a high speed by using a laser of high output. Further, since the resin member side is irradiated with a laser beam, the metal is excessively becomes hot, concerns also suppressed the characteristics of the metal is changed.
[0030]
　According to a second aspect of the present invention, the CFRP member, superposing a resin member and a glass, since the bonding of the resin member side is irradiated with a laser beam, interference between the vaporized resin component and the laser beam is suppressed can, together with the resulting joint member excellent bonding strength, it is possible to bond the CFRP member and the resin member at a high speed by using a laser of high output.
[0031]
　According to a third aspect of the present invention, between the metal and the CFRP member, by interposing an intermediate member made of resin, since the laser bonding, with the resulting joint member excellent bonding strength, the laser of high output it is possible to bond the metal and the CFRP member fast with.
[0032]
　According to a fourth aspect of the present invention, between the metal and the CFRP member, by interposing an intermediate member made of resin, since the laser bonding in one pass, with the resulting joint member excellent bonding strength, high output in addition to the possible bonding between the metal and the CFRP member at high speed using a laser, for welding process only once, there is also an effect of reducing the work load and costs.
BRIEF DESCRIPTION OF THE DRAWINGS
[0033]
FIG. 1 is a diagram showing an object to be bonded using a bonding test. (A) is a plan view of the object to be bonded, (b) shows a side view of the object to be bonded.
It is a diagram illustrating a situation in which FIG. 2 is to increase the laser output of joining a metal or CFRP member and the resin member.
3 is a diagram showing the tensile test before and after the test piece after the bonding between the metal and the resin member. (A) shows a diagram of prior tensile test after bonding, indicating the (b) is after the tensile test FIG.
4 is a diagram showing an object to be bonded of extensive glass plate used in the bonding tests with metal or CFRP member and the resin member. (A) is a plan view of the object to be bonded, (b) shows a side view of the object to be bonded.
[5] metal or CFRP member, resin, by overlapping glass is a diagram showing a situation that enhances the output of the laser joining a metal and a resin.
6 is a diagram illustrating a diagram of the tensile test before and after the test piece after the bonding between the metal and the resin member. (A) shows a diagram of prior tensile test after bonding, indicating the (b) is after the tensile test FIG.
7 is a diagram illustrating a diagram of the tensile test before and after the test pieces after bonding the CFRP member and the resin member. (A) shows a diagram of prior tensile test after bonding, indicating the (b) is after the tensile test FIG.
Is a diagram showing the joined member consisting of [8] and an intermediate member made of CFRP member and the resin. (A) is a plan view of the joint member, (b) shows a side view of the bonded members.
9 is a diagram showing a situation where by joining a CFRP member and the intermediate member.
[10] the intermediate member is a diagram showing a CFRP member joined.
11 is a diagram showing a metal, the intermediate member, the members to be welded constituted by the CFRP member. (A) is a plan view of the joint member, (b) shows a side view of the bonded members.
Is a diagram illustrating a situation where by joining a CFRP member and the metal plate through the FIG. 12 the intermediate member.
13 is a diagram showing a tensile shear strength of the bonding test piece of metal and a resin member.
14 is a diagram showing a tensile shear strength of the joint specimens of the CFRP member and the resin member.
DESCRIPTION OF THE INVENTION
[0034]
　A first aspect of the present invention, the bonding method of the metal and the resin member (hereinafter, sometimes referred to as "bonding method of the first aspect of the present invention") is a metal, a resin member and the glass in this order overlay, by irradiating a laser through the glass to the resin member surface in contact with the glass, is to bond the metal and the resin member at a welding speed 0.5m ~ 5.0m / min.
　Next, the described background investigation that led to the bonding method of the first aspect of the present invention will be described bonding method of the first aspect of the present invention.
[0035]
　The laser bonding of a metal and a resin member, has been desired to bond the metal and the resin member at a high speed. Accordingly, the present inventors have found that in order to bond at a high welding speed, by increasing the output of the laser, is irradiated with a laser beam from the resin member side, the test was carried out for bonding the metal and the resin member.
[0036]
　Figure 1 shows the object to be bonded using a bonding test. 1 (a) is a plan view of the object to be bonded, FIG. 1 (b) shows a side view of the object to be bonded. As shown in FIG. 1, a portion of the steel plate 1, polyethylene terephthalate (PET resin) as the resin member 2, the object to be bonded by overlapping a portion thereof, the two clamps spaced capable of irradiating a laser beam 3 and the steel sheet 1 and the resin member 2 was fixed in close contact with.
[0037]
　Figure 2 is a diagram showing a situation that enhances the output of the laser joining a metal and a resin member. Figure 2 is a side view of the object to be bonded in the same manner as FIG. 1 (b), the steel plate 1 which is closely fixed superimposed and the object to be bonded resin member 2, the laser beam from the resin member 2 side 4 by irradiating shows a state of joining. In the irradiation of the laser beam 4, by using a semiconductor laser, and the laser output 3 kW. Then, at a welding speed 1.5 m / min, and joined in a direction (paper surface depth direction in FIG. 2) of the width a of the joining moving direction shown in FIG. 1, a test piece was obtained. Further, in the irradiation of the laser beam 4, a defocus amount + 50mm, that is, the laser position of 50mm lower from the focal position of the lens for converging the match on the surface of the steel sheet position of the metal 1.
[0038]
　Then, the test piece after bonded superimposed in 30mm width, was carried out as shear tension test. Figure 3 shows a diagram of the tensile test before and after the test pieces after bonding. In FIG. 3 (a), shows a diagram of the previous tensile test after bonding, in FIG. 3 (b), shows a diagram after the tensile test. Figure 3 is a view of the test piece from the irradiation side of the laser beam, i.e., a diagram viewed from above the same manner specimen and FIG. 1 (a), FIG. 3 (a), in the paper depth direction, the paper when the front and upper part of the resin member 2 are superposed in the upper part of the steel plate 1.
[0039]
　Then, the test piece after the bonding, as shown in FIG. 3 (a), by laser irradiation, and the surface of the resin member 2 has a melting portion 5, which is displayed in black or gray melted, the steel plate 1 junction 6 of the portion where the resin member 2 are superimposed (part and the peripheral portion thereof is displayed in white, including the bubble) has not been almost formed. Then, the test piece after performing the shear tensile test, ruptured as superimposed portion peels off, as shown in FIG. 3 (b), divided into the steel sheet 1 and the resin member 2.
[0040]
　This resin component is volatilized by the irradiation of the laser light with high output, the resin component is discharged in the optical path of the laser beam, bonding is incomplete because the laser power is lost by interference with the laser light, the intensity of the aim It is considered to have become a thing which does not have a. Therefore, the resultant bonding material at a shear tensile test was fractured at the interface. Accordingly, the present inventors have for the means for suppressing component volatilized from the resin member from interfering with the laser light was investigated.
[0041]
　For component volatilized from the resin member is prevented from interfering with the laser light may be such that volatile components is not discharged toward the optical path of the laser beam. The present inventors, as volatilized resin component in the optical path of the laser light is not discharged, was conceived placing a glass that transmits a laser beam on the irradiation surface side of the laser beam of the resin member. Therefore, the object to be bonded with superposing the metal and resin member, further, by overlapping glass was performed the same test the bonding tests described above.
[0042]
　Figure 4 is a diagram showing an object to be bonded of extensive glass plate used in the bonding tests. 4 (a) shows a plan view of the object to be bonded, FIG. 4 (b) shows a side view of the object to be bonded. As shown in FIG. 4 (a), in the paper depth direction, when the front side and the upper side, the upper part of the steel plate 1, polyethylene terephthalate (PET resin) as the resin member 2, overlapping a portion combined to obtain a object to be bonded. Then, as shown in FIG. 4 (b), superposed so as to cover all of the plate-like glass 7 junction planned portion on the surface on the side not in contact with the steel plate 1 of the resin member 2 of the object to be bonded. Then, the steel sheet 1 at an interval that can be irradiated with laser light two clamps 3 and the resin member 2 and the glass 7 and tightly fixed.
[0043]
　Figure 5 shows a metal, a resin member, by overlapping glass, a situation which increases the output of the laser joining a metal and a resin member. Figure 5 is a side view of the object to be bonded in the same manner as FIG. 4 (b), the steel plate 1 which is closely fixed superimposed, the resin member 2 and the glass 7, the laser beam 4 from the glass 7 side It shows a situation in which joined by irradiating the joint. Then, the object to be bonded, in the direction of the width a of the joining moving direction shown in FIG. 4 (toward the depth direction of FIG. 5), performed laser bonding under the same conditions as the bonding test, a test piece was obtained.
[0044]
　Then, it was carried shear tensile test specimen after bonding. Figure 6 shows a diagram of the tensile test before and after the test pieces after bonding. In FIG. 6 (a), shows a diagram of the previous tensile test after bonding, in FIG. 6 (b), shows a diagram after the tensile test. Figure 6 is a view of the test piece from the irradiation side of the laser beam, i.e., a diagram viewed from above the same manner specimen and FIG. 4 (a), the FIG. 6 (a), in the paper depth direction, the paper when the front and upper part of the resin member 2 are superposed in the upper part of the steel plate 1.
[0045]
　The test piece after bonded, as shown in FIGS. 6 (a), (partial and the peripheral portion thereof is displayed in white, including the bubble) healthy joints 6, the steel sheet 1 and the resin without using the glass 7 than when joining member 2 was formed in two or more times wider bonding area. Then, the test piece after performing the shear tension test, as shown in FIG. 6 (b), after the highest load, extended the matrix portion of the resin member 2, the joint was maintained bonding state It was in a state. Than this, it can be seen that the joint 6 are strongly bonded.
[0046]
　This is because placing the glass 7 on the irradiation side of the laser beam 4 of the resin member 2, the resin component volatilized from the periphery of the glass 7 is discharged, be irradiated with laser light from the resin member side, volatilization resin component because no longer interfere with the laser beam. Thus, the metal, by superimposing the resin member and the glass in this order, together with a resin member side can be irradiated with laser, even by increasing the output of the laser was found that the welding speed can be joined at high speed . Also, since not performed heating by laser irradiation from the metal side, metal becomes hot, concerns also suppressed the properties of the metal is changed.
[0047]
　A first aspect of the present invention, through the study process as described above are those that led to the invention described in (1), for such the present invention will be described later for the necessary requirements and preferred features .
[0048]
　A second aspect of the present invention, the bonding method of the carbon fiber reinforced plastic (CFRP) member and the resin member (hereinafter, referred to as "bonding method of the second aspect of the present invention") is, the CFRP member, and the resin member superposed glass in this order, a laser beam is irradiated through the glass to the resin member surface in contact with the glass, is to bond the CFRP member and the resin member at a welding speed 0.5 m ~ 5.0 m / min .
　Next, the described background investigation that led to the bonding method of the second aspect of the present invention will be described bonding method of the second aspect of the present invention.
[0049]
　In bonding the CFRP member and the resin member, as well as shortening the bonding time, product damage due to vibration or the like is small, it has been desired a method for obtaining a joining member having a high joint strength. Accordingly, the present inventors have found that in joining of the resin member and the CFRP member was attempted using a laser beam welding techniques. Specifically, it was carried out as follows bonding test.
[0050]
　Figure 1 shows the bonded members using the joint test. 1 (a) is a plan view of the joint member, FIG. 1 (b) shows a side view of the bonded members. As shown in FIG. 1, a part of the CFRP member 1 ', a polyethylene terephthalate (PET resin) as the resin member 2, the workpieces by overlapping a part, at an interval capable of irradiating a laser beam 2 One of at clamp 3 and the CFRP member 1 'and the resin member 2 was fixed in close contact.
[0051]
　Figure 2 is a diagram illustrating a situation where by joining a CFRP member and the resin member. Figure 2 is a side view of the members to be welded in the same manner as FIG. 1 (b), the a superposition CFRP member 1 which is tightly fixed to 'the workpieces of the resin member 2, the resin member 2 side It shows a state in which the bonding is irradiated with a laser beam 4. Here, CFRP member 1 'includes a carbon fiber, absorbing the laser light, the resin member 2, for transmitting the laser light from the irradiation side of laser light, the resin member 2, CFRP member 1' It is superimposed in the order.
[0052]
　In the irradiation of the laser beam 4, by using a semiconductor laser, and the laser output 3 kW. Then, at a welding speed 1.5 m / min, and joined in a direction (direction perpendicular to the paper surface of FIG. 2) of the width a of the joining moving direction shown in FIG. 1, a test piece was obtained. Further, in the irradiation of the laser beam 4, a defocus amount + 50mm, that is, the position of 50mm lower from the focal position of the lens for condensing the laser to coincide with the steel sheet surface position of the CFRP member 1 '.
[0053]
　Then, the test piece after bonded superimposed in 30mm width, was carried out as shear tensile test, almost strength can not be obtained, and peeling. When checking test piece after tensile shear test, due to the fact that the carbon fibers contained in the CFRP member 1 'generates heat by absorbing the laser beam, and melting of the resin of the base material resin by propagation of the generated heat Although traces and some melting occurs in the member 2 surface was confirmed, the bonding at the interface between the CFRP member 1 'and the resin member 2 is almost not confirmed, not obtained joining member of the intensity of the aim It was.
[0054]
　This resin component is volatilized by the irradiation of the laser light with high output, the resin component is discharged in the optical path of the laser beam, bonding is incomplete because the laser power is lost by interference with the laser light, the intensity of the aim It is considered to have become a thing which does not have a. Therefore, the resulting joint member was peeled at a shear tensile test. Accordingly, the present inventors have studied means for suppressing component volatilized from the resin member interferes with the laser beam.
[0055]
　For component volatilized from the resin member is prevented from interfering with the laser light may be such that volatile components is not discharged toward the optical path of the laser beam. The present inventors, as volatilized resin component in the optical path of the laser light is not discharged, was conceived placing a glass that transmits a laser beam on the irradiation surface side of the laser beam of the resin member. Therefore, the bonded members which are superposed and CFRP member and the resin member, further, by overlapping glass was performed the same test the bonding tests described above.
[0056]
　Figure 4 is a diagram showing the bonded members of extensive glass plate used in the bonding tests. 4 (a) shows a plan view of the joint member, FIG. 4 (b) shows a side view of the bonded members. As shown in FIG. 4 (a), in a direction perpendicular to the plane, when the front side and the upper side, the upper part of the CFRP member 1 ', a polyethylene terephthalate (PET resin) as the resin member 2, a portion the superimposed, it was bonded members. Then, as shown in FIG. 4 (b), superposed so as to cover all of the predetermined joining portions a plate-shaped glass 7 on the surface on the side not in contact with the CFRP member 1 of the resin member 2 'of the workpieces . Then, CFRP member 1 with a laser beam at two clamps 3 with a gap that can be irradiated ', and the resin member 2 and the glass 7 and tightly fixed. CFRP member 1 ', PAN to one direction prepreg sheets that are created (polyacrylonitrile) based carbon fiber impregnated with 130 ° C. curable epoxy resin, 0 ° to the length direction of the fibers, 90 °, 0 °, 90 °, 0 ° may be the sum of five stacked so as to oriented.
[0057]
　Figure 5 shows CFRP member, a resin member, by overlapping glass, a situation where by joining a CFRP member and the resin member. Figure 5 is a side view of the members to be welded in the same manner as FIG. 4 (b), CFRP member 1 which is closely fixed superimposed ', the resin member 2 and the glass 7, the laser beam from the glass 7 side 4 by irradiating the joint shows a situation in which joining. Then, the bonded member in the direction of the width a of the joining moving direction shown in FIG. 4 (direction perpendicular to the paper surface of FIG. 5), performed laser bonding under the same conditions as the bonding test, a test piece was obtained.
[0058]
　Then, it was carried shear tensile test specimen after bonding. Figure 7 shows a diagram of the tensile test before and after the test pieces after bonding. In FIG. 7 (a), shows a diagram of the previous tensile test after bonding, in FIG. 7 (b), shows a diagram after the tensile test. Figure 7 is a view of the test piece from the irradiation side of the laser beam, i.e., a diagram viewed from above the same manner specimen and FIG. 4 (a), the FIG. 7 (a), in the direction perpendicular to the paper surface, the paper when the front and upper part of the resin member 2 are superposed in the upper part of the CFRP member 1 '.
[0059]
　The test piece after bonded, as shown in FIG. 7 (a), a sound joint 6 (portion displayed in white) had been formed. The test piece after performing the shear tension test, as shown in FIG. 7 (b), 'but was peeled at the bonding surface between the resin member 2, CFRP member 1' CFRP member 1 carbon fibers 17 contained in the resin has a left adhered to member 2, bonded part 6 had been strongly bonded.
[0060]
　This is because placing the glass 7 on the irradiation side of the laser beam 4 of the resin member 2, the resin component volatilized from the periphery of the glass 7 is discharged, be irradiated with laser light from the resin member side, volatilization resin component because no longer interfere with the laser beam. Thus, the CFRP member, by superimposing the resin member and the glass in this order, it is possible irradiating a laser from the resin member side, by raising the output of the laser was found that can be joined at high speed.
[0061]
　A second aspect of the present invention, through the study process as described above are those that led to the invention described in (2), for such the present invention will be described later for the necessary requirements and preferred features .
[0062]
　Method of joining the third aspect of the metal and carbon fiber reinforced resin (CFRP) member of the present invention (hereinafter, referred to as "joining method of the third aspect of the present invention") is,
first, (a), irradiated with a laser beam and, in welding speed 0.5 m ~ 5.0 m / min, and bonded to the intermediate member made of CFRP member and the
resin, followed by (b), by irradiating a laser beam, welding speed 0.5 m ~ 5.0 m / min, and bonding a metal and an intermediate member
is a method.
[0063]
　Then, (a), the superimposed intermediate members and the glass in this order CFRP member is irradiated with laser light through the glass to bond the CFRP member and the intermediate member to the intermediate member surface in contact with the glass,
　(b in), superimposed and metal, and an intermediate member, a metal is heated by irradiating a laser beam from the metal side to join the metal and the intermediate member.
[0064]
　Next, the basic form of joining method of the third aspect of the present invention will be described in detail with reference to the drawings.
[0065]
<(A) bonding the intermediate member made of CFRP member and the resin>
　First, overlay the intermediate member and the glass made of a resin in CFRP member in this order, a laser beam is irradiated through the glass to the intermediate member surface in contact with the glass bonding the CFRP member and the intermediate member Te.
[0066]
　Figure 8 shows the members to be welded constituted by the intermediate member made of CFRP member and the resin. 8 (a) shows a plan view of the joint member, FIG. 8 (b) shows a side view of the bonded members. As shown in FIG. 8 (a), in the direction perpendicular to the plane of the drawing, when the front side and the upper side, the upper side of at least the bonding scheduled portions of CFRP member 1 ', by superposing the intermediate member 2, and the bonded members .
[0067]
　For example, CFRP member 1 ', PAN to one direction prepreg sheets that are created (polyacrylonitrile) based carbon fiber impregnated with 130 ° C. curable epoxy resin, 0 ° to the length direction of the fibers, 90 ° , 0 °, can be assumed that 90 °, were laminated a total of five sheets as oriented in 0 °, intermediate member 2 may be a polyethylene terephthalate (PET resin).
[0068]
　Then, as shown in FIG. 8 (b), superposed so as to cover all of the plate-like glass 7 predetermined joining point of the intermediate member 2 of the CFRP member 1 'does not contact with the side surface of the workpieces. Also, CFRP member 1 with a laser beam at two clamps 3 with a gap that can be irradiated ', may the intermediate member 2 and the glass 7 adhesion fixed.
[0069]
　9 shows CFRP member, the intermediate member, by overlapping glass, a situation where by joining a CFRP member and the intermediate member. Figure 9 is a side view of the members to be welded in the same manner as FIG. 8 (b), the superposition CFRP member 1 is tightly fixed in ', the intermediate member 2 and the glass 7, the laser beam from the glass 7 side 4 by irradiating the joint shows a situation in which joining. Then, the workpieces, for example, in the direction of the width a of the joining moving direction shown in FIG. 8 (direction perpendicular to the paper surface of FIG. 9), by irradiating laser, a carbon fiber contained in CFRP member 1 'of the welding point allowed to exotherm, and melt the resin of the CFRP member 1 'according to which the melting of the intermediate member 2 by propagation of the generated heat to bond the two.
[0070]
　In the irradiation of the laser beam 4, for example, by using a semiconductor laser, and the laser output 3 kW, joined at a welding speed of 1.5 m / min. Further, in the irradiation of the laser beam 4, a defocus amount + 50mm, that is, to the position of 50mm lower from the focal position of the lens for converging the laser is matched to the surface position of the CFRP member 1 '.
[0071]
　Figure 10 shows a CFRP member intermediate member is joined. Figure 10 is a view of the CFRP member intermediate member is joined from the irradiation side of the laser beam, i.e., a diagram viewed from above the same manner specimen and FIG. 1 (a), in the direction perpendicular to the plane of the drawing sheet surface before when the side and upper, intermediate member 2 is superimposed on the upper part of the CFRP member 1 '. As shown in FIG. 10, it is possible to form a sound joint 6 (portion displayed in white).
[0072]
　If no glass 7 placed on the irradiation side of the laser beam 4 of the intermediate member 2, the resin component is volatilized by the irradiation of the laser light with high output, the resin component is discharged in the optical path of the laser beam, the interference between the laser beam laser power is lost, the bonding is incomplete. In contrast, as in the welding method of the present invention, by installing the glass 7 on the irradiation side of the laser beam 4 of the intermediate member 2, the resin component volatilized from the periphery of the glass 7 is discharged, the volatile resin component is not interfere with the laser beam 4, by raising the output of the laser can be bonded at a high speed.
[0073]
<(B) metal and bonding the intermediate member>
　Next, superimposing a metal and CFRP member intermediate member is joined, by irradiating a laser beam from the metal side to bond the metal and the intermediate member.
[0074]
　Figure 11 shows the metal, the members to be welded constituted by the CFRP member intermediate member is joined. 11 (a) is a plan view of the joint member, FIG. 11 (b) shows a side view of the bonded members. As shown in FIG. 11 (a), overlapping at least a joint scheduled portion of the metal plate 1 and the CFRP member 1 ', and the bonded members. Then, as shown in FIG. 11 (b), superposed metal plate 1 on the surface on the side not in contact with the CFRP member 1 of the intermediate member 2 '. Also, CFRP member 1 with a laser beam at two clamps 3 with a gap that can be irradiated ', may the intermediate member 2 and the metal plate 1 contact fixing.
[0075]
　12 shows a situation where the CFRP member, the intermediate member, superposing a metal plate, and bonding the CFRP member and the metal plate. Figure 12 is a bonded member in the same manner as FIG. 11 (b) is a view seen from the side, superposed CFRP member 1 is tightly fixed in ', the intermediate member 2 and the metal plate 1, a metal plate 1 side It shows a situation in which joining a laser beam 4 is irradiated to the surface of the metal plate 1. Then, the bonded member in the direction of the width a of the joining moving direction shown in FIG. 11 (direction perpendicular to the paper surface of FIG. 12), by irradiating a laser under the same conditions as the bonding test of the CFRP member and the resin member, metal and heating and melting the intermediate member 2 by the heat conduction, to join the two.
[0076]
　In the irradiation of the laser beam 4 can be employed the same conditions as the junction between the CFRP member and the resin member of the (a). For example, by using a semiconductor laser, and the laser output 3 kW, the defocus amount + 50 mm, the welding speed 1.5 m / min. Incidentally, the position of 50mm downward to match the surface position of the metal plate 1 from the focal position of the lens for focusing the laser.
[0077]
　Then, it was carried shear tensile test the bonding member between the joined CFRP member and the metal plate. The metal plate 1 after the tensile test, the intermediate member 2 has been a remain joined. The fracture occurs at CFRP member 1 ', a part of the CFRP member was adhered to the intermediate member 2 which is to remain joined to the metal plate 1. Than this, the tensile strength of bonding member affects the tensile strength of the CFRP member, the bonded portion has been firmly bonded.
[0078]
　Thus, by interposing the intermediate member made of a resin as an adhesive layer between the metal and the CFRP member, by raising the output of the laser, it is possible to bond at a high speed, and a metal having a sufficient bonding strength bonding member and the CFRP member is obtained.
[0079]
　Further, the bonding members between the metal and the CFRP member, occurs joint surfaces from electrolytic corrosion reaction, there is a problem that results in it due to local corrosion of the metal, obtained by welding method of the third aspect of the present invention junction member, the intermediate member made of resin between the metal and the CFRP member is inserted, the local corrosion of the metal can be suppressed.
[0080]
　A third aspect of the present invention, through the study process as described above are those that led to the invention described in (3), for such the present invention will be described later for the necessary requirements and preferred features .
[0081]
　Method of joining the fourth aspect of the metal and carbon fiber reinforced resin (CFRP) member of the present invention (hereinafter, referred to as "bonding method of the fourth aspect of the present invention") is,
　the CFRP member, an intermediate member made of a resin metal and, superimposed in this order, are irradiated from the metal side to the laser beam to the joint at welding speed 0.5 m ~ 5.0 m / min, in which the respective members will be one pass junction.
[0082]
　Next, the basic form of joining methods of the fourth aspect of the present invention will be described in detail with reference to the drawings.
[0083]
　First, overlay the intermediate member and the metal of the resin in CFRP member in this order, by a laser beam irradiation only pass from the metal side, bonding the CFRP member and a metal through an intermediate member.
[0084]
　11 shows CFRP member, the intermediate member, and the members to be welded made of a metal. 11 (a) is a plan view of the joint member, FIG. 11 (b) shows a side view of the bonded members. As shown in FIG. 11 (a), overlapping at least a joint scheduled portion of the CFRP member 1 'and the metal plate 1 through the intermediate member 2, and the bonded members. Then, as shown in FIG. 11 (b), superposed metal plate 1 on the surface on the side not in contact with the CFRP member 1 of the intermediate member 2 '. Also, CFRP member 1 with a laser beam at two clamps 3 with a gap that can be irradiated ', may the intermediate member 2 and the metal plate 1 contact fixing.
[0085]
　12 shows a situation where the CFRP member, the intermediate member, superposing a metal plate, and bonding the CFRP member and the metal plate. Figure 12 is a bonded member in the same manner as FIG. 11 (b) is a view seen from the side, superposed CFRP member 1 is tightly fixed in ', the intermediate member 2 and the metal plate 1, a metal plate 1 side It shows a situation in which joining a laser beam 4 is irradiated to the surface of the metal plate 1. Then, the bonded member in the direction of the width a of the joining moving direction shown in FIG. 11 (direction perpendicular to the paper surface of FIG. 12), by laser irradiation of one pass only, to heat the metal, the intermediate member 2 by the heat conduction melted and, joining CFRP member and metal.
[0086]
　In the irradiation of the laser beam 4, for example, by using a semiconductor laser, and the laser output 3 kW, joined at a welding speed of 1.5 m / min. Further, in the irradiation of the laser beam 4, a defocus amount + 50mm, that is, the position of 50mm downward to match the surface position of the metal plate 1 from the focal position of the lens for focusing the laser.
[0087]
　In a fourth aspect of the present invention, since the laser irradiation to the metal, not directly laser irradiation to the intermediate member 2. Therefore, a possibility that the resin component is volatilized by the irradiation of laser light of high output is small. Also, event, even as a resin component has evaporated, by installing the metal 1 to the irradiation side of the laser beam 4 of the intermediate member 2, the resin component volatilized from the surrounding metal 1 is discharged, and volatile resin component is not interfere with the laser beam 4, by raising the output of the laser can be bonded at a high speed. Thus, efficient, by irradiating a laser to heat the metal, and melting the intermediate member 2 by the heat conduction, it is possible to bond the CFRP member and metal.
[0088]
　Then, it was carried shear tensile test the bonding member between the joined CFRP member and the metal plate. The metal plate 1 after the tensile test, the intermediate member 2 has been a remain joined. The fracture occurs at CFRP member 1 ', a part of the CFRP member was adhered to the intermediate member 2 which is to remain joined to the metal plate 1. Than this, the tensile strength of bonding member affects the tensile strength of the CFRP member, the bonded portion has been firmly bonded.
[0089]
　Thus, by interposing the intermediate member made of a resin as an adhesive layer between the metal and the CFRP member, by raising the output of the laser, it is possible to pass the junction at high speed, a metal having a sufficient bonding strength bonding member and the CFRP member is obtained with. Since a single pass junction, you are possible to once welding process leads to a reduction of the work load and costs.
[0090]
　Further, the bonding members between the metal and the CFRP member, occurs joint surfaces from electrolytic corrosion reaction, there is a problem that results in it due to local corrosion of the metal, obtained by welding method of the fourth aspect of the present invention junction member, the intermediate member made of resin between the metal and the CFRP member is inserted, the local corrosion of the metal can be suppressed.
[0091]
　A fourth aspect of the present invention, through the study process as described above are those that led to the invention described in (4), for such the present invention is described below for the necessary requirements and preferred features .
[0092]
　First, used in the present invention, metal, CFRP member, the resin member (made of a resin intermediate member) and the glass will be described.
[0093]
(Bonded as metal)
　metal to be joined is a metal used in automobiles and the like, including chemical composition, not particularly limited. Also, when irradiating the laser beam from the resin member side (first embodiment), for heating the surface of the metal, the thickness of the metal is also not particularly limited. When irradiating a laser beam from the metal side (a third aspect, the fourth aspect), by irradiating a laser beam from the non-contact surface side of the intermediate member, and heating the contact surfaces of the intermediate member by heat conduction, for melting the intermediate member, the thickness of the metal is preferably less 3.5 mm. As such a metal, steel and the like. Further, it is preferable that no treatment layer such as plating on the surface of the metal.
[0094]
(CFRP member is bonded)
　CFRP member to be joined is not limited in particular, it can be selected from known CFRP member by using embodiments. As the carbon fibers constituting the CFRP member, PAN (polyacrylonitrile) based carbon fiber, pitch-based carbon fibers and the like. In particular, PAN-based carbon fibers, strength, elastic modulus, the balance of the elongation is good. As the resin constituting the CFRP member, epoxy resins, phenolic resins, benzoxazine resins, vinyl ester resins, and thermosetting resins such as unsaturated polyester resins, polyethylene, polypropylene resins, polyamide resins, ABS resins, urethane resins , Pochi butylene terephthalate resin, polyacetal resin, thermoplastic resins such as a resin such as polycarbonate are exemplified.
[0095]
(Joined by a resin member or intermediate member made of a resin)
　material and comprising resin bonded by a resin member (or intermediate member made of a resin), as long as it transmits laser light to be used, is particularly limited those not, nylon 6 (PA6) or the like of the polyamide resin (PA), polyester resins such as polyethylene terephthalate (PET), polycarbonate (PC) resin, a styrene resin such as ABS, the heat of an acrylic resin (PMMA, etc.) thermoplastic resin. The resin may be one that is a filler is added to improve characteristics such as fibrous filler.
[0096]
　Transmittance for the laser beam used in the resin member (or intermediate member), in order to increase the welding speed is preferably 60% or more, more preferably 80% or more. The thickness of the resin member (or intermediate member) or equal to 0.2mm or 5.0mm or less. If it is less than 0.2 mm, heat capacity will melt small, may not be joined, it may sufficient bonding strength can not be obtained. If it exceeds 5.0 mm, the attenuation of the laser beam is large, not supplied enough laser power to steel, it may not be joined.
　In the fourth aspect, in one pass bonding, by heating the metal, for melting the intermediate member by the heat conduction, it is preferable that the thickness of less than 1.0 mm. Exceeds 1.0mm may not be sufficiently melted resin in the laser irradiation of only one pass.
[0097]
(Glass superimposed on the resin member or the intermediate member)
　glass is superposed on the surface on the side where the laser beam of a surface opposite that in contact with the metal or CFRP member of the resin member (or intermediate member) is irradiated. This glass, as volatile to the resin component does not interfere with the laser beam, is intended to discharge from the outer periphery of the glass plate volatile components. Glass, transmits the laser beam to be used, as long as it does not react with volatile resin component is not limited in particular, quartz glass is exemplified.
[0098]
　Transmittance of the glass to the laser beam used in order to increase the welding speed is preferably 60% or more, more preferably 90% or more. In order to increase the transmittance, it is desirable to parallel polished front and back surfaces of the glass. The thickness of the glass, or equal to 1.0mm or 5.0mm or less. The 1mm or less, when gripped by the clamp, may not withstand its pressure. Since it is not essential to grip by clamping, it is also possible to use a thin glass than 1.0 mm. If it exceeds 5.0 mm, laser light is hardly transmitted, workability of the bonding is lowered. The width of the glass is so volatile that the resin component is discharged so as not to interfere with the laser beam is preferably larger than the width of the predetermined joining portion.
[0099]
　Glass, the surface of the glass of the portion overlapping the junction planned portion, it is preferable that anti-reflection film that prevents reflection of the laser light is provided. Laser light may be reflected about 20% of glass in accordance with its wavelength, it is pressed to the reflection of about several% by providing an antireflection film on the surface of the glass, utilizing the energy of the laser efficiently It can be, it is possible to weld at high speed. Antireflection film is not limited in particular, according to the wavelength of the laser beam, it is possible to form a known antireflection film.
[0100]
　Resin component volatilized by glass, is drained from the outer periphery of the glass, so as not to interfere with the laser beam. The volatile components exhausted from the outer periphery of the glass, by performing the air blowing, may be diffused. This enables more reliably suppress the interference to the laser beam of the volatile component. As a means of blowing, blower, fan, it is possible to use a gas jet and the like.
[0101]
(Metal, CFRP member, an intermediate member made of a resin member or a resin, the shape of the glass)
　shape of the metal to be joined, CFRP member and the resin member (or intermediate member) may be at least the joint plate-like, laser when viewed from the irradiation side, rectangular, circular, elliptical, etc. may be of any shape and may not entirely a plate. For example, bending, press working, may be drilling or the like have been subjected, it is intended to include a flange portion of the members that are press-molding or the like to the particular shape of the cross-section a hat-shaped.
[0102]
　The intermediate member is one in which is provided as an adhesive layer on the bonding scheduled portions of the metal and the CFRP member as part and replacing members of metal for lighter components, or equip various properties to the component it may alternatively be provided as a member for. In that case, a shape that can cover the predetermined joining portion of at least a metal and CFRP member may be shaped in accordance with the use aspect, similarly to the shape of the metal and CFRP member, at least the joint is a plate-like any if may be any shape, the whole may not be a plate shape.
[0103]
　Further, the glass as long as it can cover the predetermined joining portions are adjusted according to the shape of the metal, CFRP member and the resin member (or intermediate member). The cover the predetermined joining portions, one or more times the width of the predetermined joining portion, or cover more than one times the light collecting area of ​​the laser beam at a joint interface between the metal or CFRP member and the resin member (or intermediate member) it is.
[0104]
　Next, a description will be given of a laser welding apparatus and laser welding method.
　The laser welding apparatus used in the bonding method of the present invention is not limited in particular, it is possible to employ a conventional laser welding apparatus. Further, the laser welding apparatus, it is also possible to use a remote laser head.
[0105]
　The laser welding apparatus includes a laser oscillator, an optical path, the converging optical system, drive system, and a shield gas system, etc.. As the laser oscillator, CO 2 lasers, YAG lasers, fiber lasers, laser can be used for example, DISK laser. Laser oscillated by the laser oscillator is guided to the condensing optical system through the optical path. Condensing optical system, such as parabolic surface mirror and the condenser lens is composed of, for condensing the laser that has been transmitted. Focus position of the laser is variable, for example, bonding with the case where the laser is irradiated through the glass (the first to third aspects), metal and resin member or,, CFRP member and the resin member (intermediate member) in the interface, the condensing area of the laser beam 40.85Mm 2 so that the sets a predetermined defocus amount may be adjusted. When a laser is irradiated to the metal (the third aspect, the fourth aspect), the metal is heated, so melting the intermediate member by the heat conduction, so that the desired light collecting area is obtained at the surface position of the metal to, to set the amount of defocus, may be adjusted. Condensing shape can be rectangular or elliptical shape or the like. Then, a laser beam is irradiated to the joining member, thereby advancing the bonded by moving the drive system. Cause moved can be focusing optical system may be bonded members. Or it may be scanned with a laser beam with a galvano mirror. It is also possible to use a semiconductor laser light emitted from the oscillator without using the optical path is guided directly condensing optical system. Shielding gas may be used if necessary.
[0106]
(Laser welding method)
　In the laser bonding method, superimposing a case where the laser is irradiated through the glass (the first to third aspects), metal and resin member, CFRP member and the resin member (intermediate member), a resin member by placing the glass on the laser irradiation surface side of the (intermediate member), to increase the laser output, joining the welding speed faster manner. At this time, the laser output 2 ~ 4 kW, the condensing area 20 ~ 60 mm 2 , can be carried out in joining conditions of welding speed 0.5 ~ 5.0 m / min, very bonding at a high speed as compared with the prior art is realized that. When a laser is irradiated to the metal (the third aspect, the fourth aspect), can also be laser to adopt the same conditions as when transmitted through the glass to the joining of the members. Condensing shape such as rectangular or oval, and is not particularly limited. Further, if the welding speed is less than 0.5 m / min, since the output volatilization amount of resin is less low interference to the laser beam by volatilization resin does not occur, the metal or CFRP member and the resin member (intermediate member ) can be bonded with. High-power laser and welding speed is more than 5 m / min is required, the use of laser of such high output resin member or a metal is affected by the heat, there is a risk that its properties may change.
[0107]
　The metal, CFRP member, the resin member (intermediate member), and, if glass is pressure fixed, preferably for more bonding strength improves. Metal, CRFP member, the resin member (intermediate member), and, pressing fixing method of a glass is not particularly limited, such as by clamps, sandwiched therebetween method for pressure fixing can be exemplified.
Example
[0108]
　Next, a description will be given of an embodiment of the present invention, conditions in examples are an example of conditions adopted for confirming the workability and effects of the present invention, the present invention is, in this single condition example the present invention is not limited. The present invention does not depart from the gist of the present invention, as long as they achieve the object of the present invention, it is capable of adopting various conditions.
[0109]
　(Invention Example 1: bonding between the metal and the resin member)
　First, a metal to be joined is a steel sheet having a thickness of 1.4 mm, bonded by a resin member is a PET resin having a thickness of 2.0 mm, both both, the width a of the joining moving direction in FIG. 4 is 30 mm, the bonding direction of travel vertical length b1 and b2 were used for 150 mm. Glass, diameter Fai54.6Mm, a circular plate shape having a thickness of 1.5 mm, using a quartz glass having an antireflection film. Then, as shown in FIG. 4, overlapping a portion of the part of steel plate and the resin member, the overlap width a of the joining moving direction of the parts and 30 mm, a length b3 in the joint direction of travel and vertical overlapping portion 45 was ~ 50mm. Then, the glass plate so as to cover the entire overlapping portion mounted on the resin member, a steel sheet with two clamps with a gap that can be irradiated with laser light, the resin member and the glass and tightly fixed.
[0110]
　Laser using a semiconductor laser having a wavelength of 940 nm. 86% transmittance of the resin member with respect to the laser beam, the transmittance for the laser beam of the glass was 93%. Then, as the laser output 3 kW, by irradiating a laser through the glass to the resin member surface in contact with the glass, by moving the irradiation position of the laser beam in a direction at a welding speed of 1.5 m / min, a metal and a resin member bonded to obtain a test piece 1-1 of Inventive example 1. Further, in the laser beam irradiation, the bonding portion was set to defocus amount + 50 mm in the optical axis direction of the laser beam. Condensing size estimated at 4.3 mm × 9.5 mm, the light collecting area 40.85Mm 2 is a rectangular.
[0111]
　In Comparative Example 1-2, except using no glass, a metal and a resin member and a laser bonding the same materials and bonding conditions as Inventive Example 1 to obtain a test specimen 1-2. In Comparative Example 1-3, without using a glass plate, except that the welding speed 0.3 m / min, with the same materials and bonding conditions as Inventive Example, a metal and a resin member and a laser bonding, to obtain a test piece 1-3.
[0112]
　The test piece after bonded superimposed in 30mm width, was carried out as shear tension test. Figure 13 illustrates a tensile shear strength of the test piece. Specimens 1-1 joined by welding speed of 1.5 m / min using a glass, as compared with the test piece 1-2 joined by welding speed of 1.5 m / min without using a glass plate, a shear high tensile strength. Further, the test piece 1-1, as compared with the test piece 1-3 joined by welding speed of 0.3 m / min in a glass-free, tensile shear strength was comparable. Than this, the glass plate on top of the resin member by laser bonding, even a faster welding speed, high joint of bonding strength could be obtained.
[0113]
　(Inventive Example 2: CFRP member and joining of the resin member)
　First, joined the CFRP member is a plate having a thickness of 1.4 mm, bonded by a resin member is an PET resin having a thickness of 2.0mm , both the width a of the joining moving direction in FIG. 4 is 30 mm, the bonding direction of travel vertical length b1 and b2 were used for 150 mm. Glass, diameter Fai54.6Mm, a circular plate shape having a thickness of 1.5 mm, using a quartz glass having an antireflection film.
[0114]
　Then, as shown in FIG. 4, overlapping a portion of the part and the resin member of CFRP member, it overlaps the width a of the joining moving direction of the part and 30 mm, overlap partially joined traveling direction of the vertical length of the b3 It was a 45 ~ 50mm. Then, the glass plate so as to cover the entire overlapping portion mounted on the resin member, the CFRP member in two clamps spaced capable of irradiating a laser beam, a resin member and a glass closely fixed.
[0115]
　Laser using a semiconductor laser having a wavelength of 940 nm. 86% transmittance of the resin member with respect to the laser beam, the transmittance for the laser beam of the glass was 93%. Then, as the laser output 3 kW, by irradiating a laser through the glass to the resin member surface in contact with the glass, by moving the irradiation position of the laser beam in a direction at a welding speed of 1.5 m / min, CFRP member and the resin member joining the door to obtain a test piece 2-1 of invention example 2. Further, in the laser beam irradiation, the bonding portion was set to defocus amount + 50 mm in the optical axis direction of the laser beam. Condensing size estimated at 4.3 mm × 9.5 mm, the light collecting area 40.85Mm 2 is a rectangular.
[0116]
　In Comparative Example 2-2, except using no glass, and a CFRP member and the resin member and a laser bonding the same materials and bonding conditions as Inventive Example, a test piece was obtained 2-2.
[0117]
　The test piece after bonded superimposed in 30mm width, was carried out as shear tension test. Figure 14 shows the tensile shear strength of the test piece. Specimens 2-1 joined with glass, as compared with the test piece 2-2 joined without using the glass plates, the shear tensile strength is very high. Than this, glass that on top of the resin member to laser bonding, even a faster welding speed, high joint of bonding strength could be obtained.
[0118]
　(Invention Example 3: bonding between the metal and the CFRP member via the intermediate material)
　First, a metal to be joined is a steel sheet having a thickness of 1.4 mm, CFRP member to be joined, the thickness 1.0mm plate , and the intermediate member made of a resin to be bonded is a PET resin having a thickness of 2.0 mm, width a 30 mm, the joining moving direction length b1 of the vertical 45 ~ 50 mm of the bonding traveling direction in FIG. 11 , b2 and b3 is used as the 150 mm.
[0119]
　Then, as shown in FIG. 8, overlapping a part and the intermediate member of the CFRP member, the overlap width a of the joining moving direction of the parts and 30 mm, the overlapping portions 45 ~ 50 mm length of the joining moving direction and vertical and the. Then, place the glass plate so as to cover the entire overlapping portion on the intermediate member, CFRP member in two clamps spaced capable of irradiating a laser beam, the intermediate member and the glass was fixed in close contact. Glass, diameter Fai54.6Mm, a circular plate shape having a thickness of 1.5 mm, using a quartz glass having an antireflection film.
[0120]
　Laser using a semiconductor laser having a wavelength of 940 nm. Transmittance for the laser beam of the intermediate member is 86%, the transmittance for the laser beam of the glass was 93%. Then, as the laser output 3 kW, by irradiating a laser through the glass to the resin member surface in contact with the glass, by moving the irradiation position of the laser beam in a direction at a welding speed of 1.5 m / min, CFRP member and the intermediate member I was joining the door. Further, in the laser beam irradiation, the bonding portion was set to defocus amount + 50 mm in the optical axis direction of the laser beam. Condensing size estimated at 4.3 mm × 9.5 mm, the light collecting area 40.85Mm 2 is a rectangular.
[0121]
　Next, as shown in FIG. 11, superimposed metal CFRP member intermediate member is joined, the overlap width a of the joining moving direction of the parts and 30 mm, the overlap joint traveling direction of the vertical length of the portion 45 It was ~ 50mm. Then, the metal, the CFRP member and the intermediate member is tightly fixed in two clamps spaced capable of irradiating a laser beam.
[0122]
　Laser, a semiconductor laser having a wavelength of 940 nm, as the laser output 3 kW, by irradiating a laser beam to the metal surface, at a welding speed 1.5 m / min, by moving the irradiation position of the laser beam in a direction, and a metal , by joining a CFRP member intermediate member is joined to obtain a test piece 3-1 of invention example 3. Further, in the laser beam irradiation, the metal surface was set to defocus amount + 50 mm in the optical axis direction of the laser beam. Condensing size estimated at 4.3 mm × 9.5 mm, the light collecting area 40.85Mm 2 is a rectangular.
[0123]
　In Comparative Example 3-2, without an intermediate member, the same material and joining conditions and the test piece 3-1, superposing the metal and CFRP member directly bonded by irradiating a laser beam from the metal side , to obtain a test piece 3-2.
[0124]
　For the test piece, it was performed the tensile shear test. Specimens 3-1 is that the tensile strength was 600N, the test piece 3-2, were only clamped in a tensile tester got peeled off metal and CFRP member.
[0125]
　(Invention Example 4: pass the junction between the metal and the CFRP member via the intermediate material)
　First, a metal to be joined is a steel sheet having a thickness of 1.4 mm, CFRP member to be joined, the thickness 1.0mm a plate, an intermediate member made of a resin to be bonded is a PET resin having a thickness of 1.0 mm, 30 mm width a of the joining moving direction in FIG. 11, the joining moving direction length b1 of the vertical 45 to 50mm, b2 and b3 was used as of 150mm.
[0126]
　Then, as shown in FIG. 11, overlapping a portion the intermediate member and the metal of the CFRP member, the overlap width a of the joining moving direction of the parts and 30 mm, the overlap joint traveling direction of the vertical length of the portion 45 It was ~ 50mm. Then, CFRP member in two clamps spaced capable of irradiating a laser beam, the intermediate member and the metal closely fixed.
[0127]
　Laser, a semiconductor laser having a wavelength of 940 nm, as the laser output 3 kW, by irradiating a laser beam to the metal surface, at a welding speed 1.5 m / min, was moved the irradiation position of the laser beam only a single pass in a direction. Thus, by heating the metal, and melting the intermediate member by the heat conduction, by joining CFRP member and metal, to obtain a test piece 4-1 Inventive Example 4. Further, in the laser beam irradiation, the metal surface was set to defocus amount + 50 mm in the optical axis direction of the laser beam. Condensing size estimated at 4.3 mm × 9.5 mm, the light collecting area 40.85Mm 2 is a rectangular.
[0128]
　In Comparative Example 4-2, without an intermediate member, the same material and joining conditions and the test piece 4-1, superposing the metal and CFRP member directly bonded by irradiating a laser beam from the metal side , to obtain a test piece 4-2.
[0129]
　For the test piece, it was performed the tensile shear test. Specimens 4-1 is that the tensile strength was 600N, the test piece 4-2, were only clamped in a tensile tester got peeled off metal and CFRP member.
Industrial Applicability
[0130]
　According to the present invention, bonding between the metal and the resin member, the bonding of the CFRP member and the resin member, and bonding between the metal and the resin member through the intermediate member, can be realized at high speed, and, their bonding strength Are better. Furthermore, in a single pass welding, bonding between the metal and the resin member through the intermediate member is also possible. Accordingly, the present invention has high industrial applicability.
DESCRIPTION OF SYMBOLS
[0131]
　1 steel plate
　1 'CFRP member
　2 resin member, the intermediate member
　3 Clamp
　4 laser beam
　5 fused portion
　6 joining portion
　7 glass
　a joining moving direction of the width
　in the joint direction of travel of b1 resin vertical length
　in the joint direction of travel of b2 metal the length of the vertical
　junction length in the traveling direction and vertical b3 overlapping portion

The scope of the claims
[Claim 1]
　The joining method of superposing a metal and a resin member joining the resin member side is irradiated with a laser beam,
　the metal, the resin member and the glass where the laser beam is transmitted, superimposed in this order, wherein the resin member and irradiating the laser beam from the side through the glass superimposed joint of the metal and the resin member, a metal and a resin, characterized in that bonding at a welding speed 0.5 m ~ 5.0 m / min method of joining members.
[Claim 2]
　The joining method for joining a resin member side is irradiated with laser light by superimposing a carbon fiber reinforced resin member and the resin member,
　the carbon fiber reinforced resin member, the resin member and the glass where the laser beam is transmitted, this superimposed in order, by irradiating the laser light through the glass from the resin member side superimposed joint of the resin member and the carbon fiber reinforced plastic member, welding speed 0.5 m ~ 5.0 m / method of joining carbon fiber reinforced resin member and the resin member, characterized in that bonding at min.
[Claim 3]
　A method of joining by irradiation with laser light and the metal and carbon fiber reinforced resin member through the intermediate member made of resin,
　and bonding the intermediate member, wherein the carbon fiber reinforced resin member and the laser beam is made of a resin which transmits then is intended to bonding the with the intermediate member of metal,
　when the bonding between the carbon fiber reinforced resin member and the intermediate member, the carbon fiber reinforced plastic member, the intermediate member and the glass, this order in superposition, from the intermediate member side through the glass laser beam is irradiated to the superimposed joint of the carbon fiber reinforced resin member and the intermediate member, at a welding speed 0.5 m ~ 5.0 m / min joined,
　during the intermediate member and the bonding of the metal, the the surface of the intermediate member, superposing the metal, by heating the metal by irradiating a laser beam to the metal surface of the joint, welding speed 0. Joined with 5 m ~ 5.0 m / min
joining method of metal and carbon fiber reinforced resin member through the intermediate member, characterized in that.
[Claim 4]
　Via an intermediate member made of a resin and a metal and carbon fiber reinforced resin member in a method for joining by laser beam irradiation of only a single pass,
　the carbon fiber reinforced plastic member, said metal and said intermediate member, superimposed in this order , the metal side of the laser beam is irradiated to the superimposed joint of the metal and the carbon fiber reinforced resin member and the intermediate member, to pass joined by welding speed 0.5 m ~ 5.0 m / min
, characterized in that method of joining the metal and carbon fiber reinforced resin member through the intermediate member to.