FIELD OF THE INVENTION

00001. The present invention relates to a novel coating composition for the electrode coating of rutile coated stick or more particularly E6013 electrode for having high charpy-V notch toughness requirement as equivalent to E7018.
BACKGROUND OF THE INVENTION
2. Rutile coated stick welding electrode have found their wide usage in application like structural welding and in general purpose welding.
3. Rutile coated electrode as the name suggest are rich in rutile content , and are responsible for better performance of electrode in terms of arc stability and better arc performance, and smooth bead surface, easy slag removal. The rutile coated electrodes are classified as per SFA-5.1 E6013.The design requirements of the E6013, includes the following conditions.
Chemical composition


4. The AWS section II C is silent about the charpy-V notch toughness requirement for E6013 electrode type.
5. However/whereas the SFA-5.1 indicate the charpy-V notch toughness requirement for E7018 grade of electrode. Technically E7018 is a (LH) basic coated stick welding electrode, which produces high strength and tougher weld material as compared to the weld material of E6013. It is very well understand in literature that obtaining higher toughness for high strength weld material is difficult. E6013 is better than E7018. But the classifying standard (SFA-5.1) recommends E7018 for toughness test and E6013 only for tension test.
6. In general E6013 are never listed for toughness test. Due to the presence of excess diffusible hydrogen, the charpy-V notch toughness values would be very less without preheat.
7. The present invention provides a formulation of coating for E6013 electrode to produce toughness equivalent to E7018 without preheat.
OBJECTS OF THE INVENTION
00008. It is therefore the primary object to provide a coating formulation of
rutile coated stick welding electrodes tor improved toughness.
00009. Another object of the present invention is to provide a coating
formulation, which can be used for coating of E6013 stick welding electrode to
produce improved toughness equivalent to E7018.
000010. Yet another object of the present invention is to provide a coating
formulation, where the E6013 electrode provides charpy-V notch value greater
than 27 J at -30°C.

000011. Further object of the present invention is to provide a coating
formulation, which is simple, economic yet environment friendly.
SUMMARY OF THE INVENTION
12. One or more drawbacks of conventional coating composition of rutile coated stick are overcome, and additional advantages are provided through the composition as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in details herein and are considered to be part of the claimed disclosure.
13. A novel coating composition of rutile coated stick welding electrode comprises the components such as cellulose, limestone, titanium dioxide rutile, feldspar, mica, clay, ferromanganese, sodium silicate, potassium silicate, boron and titanium.
14. Characterized in that the composition provides high charpy-V notch toughness values.
15. Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments.
16. It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
17. The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and

features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
18. While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents and alternative falling within the scope of the disclosure.
19. It is to be noted that a person skilled in the art would be motivated from the present disclosure to arrive at a method for assessing the novel coating composition for the electrode coating of E70XX series of electrodes. Such composition may vary based on combination of one or more ingredients. However, such modifications should be construed within the scope of the disclosure.
20. As used in the description herein and throughout the claims that follow, the meaning of “a”, “an”, and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
21. The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a method, composition coating, electrode, toughness that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such method, or assembly, or

method. In other words, one or more elements in a system or device proceeded by “comprises…..a “does not, without more constraints, preclude the existence of other elements or additional elements in the system, apparatus or device.
22. The present subject matter relates to a novel coating composition of rutile coated electrode such as E70XX series of electrode or more particularly E6013 stick electrode, which is designed in such a way that the weld material produced by it shows improved toughness values when listed for it. In other words the toughness obtained would be meeting the toughness requirement of E7018.
23. In general, E6013 stick welding electrodes never provide substantially toughness equivalent to E7018 electrodes, and not test for toughness test, as E6013 electrodes possess more diffusible hydrogen and hence the toughness value measured in charpy-V notch value would be less than the basic coated electrode like E70XX series.
24. The coating composition of the rutile coated electrode has incorporated boron and titanium as micro alloying elements.
25. The detailed composition is given in Table 1.


000026. The E6013 stick welding electrode is designed with carbon steel core
wire having diameter of 4mm.
000027. The design of the formulation of the electrode coating is conducted in
such a way that the weld metal produced by the E6013 electrodes have the
toughness (charpy-V) value equivalent to E7018 i.e. >(27) J at -30°C.
000028. The weld metal deposited by the designed stick welding electrode is
tested for the charpy-V notch toughness values. The values obtained are meeting
the criteria of minimum toughness for E7018 (LH). The values shown below
indicate the improved toughness values.

29. Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the “invention” may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the “invention” will refer to subject matter recited in one or more, but not necessarily all, of the claims.
30. Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of

a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
000031. The present disclosure provides a novel coating composition for rutile
coated stick welding electrode.
Equivalents:
32. With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
33. It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to”, the term “having” should be interpreted as “having at least”, the term “includes” should be interpreted as “includes but is not limited to”, etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a”

and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, eve it a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations”, without other modifiers, typically means at least two recitations, or two or more recitations).
34. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
35. The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
36. While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

WE CLAIM :

1. A novel coating composition of rutile coated stick welding electrode comprises
the components such as cellulose, limestone, titanium dioxide rutile, feldspar,
mica, clay, ferromanganese, sodium silicate, potassium silicate, boron and
titanium.
Characterized in that the composition provides high charpy-V notch toughness values.
2. The novel coating composition as claimed in claim 1, wherein the quantity of
the ingredients are given below in percentage:

3. The novel coating composition as claimed in claim 1, wherein the rutile coated
stick welding electrode is E6013 stick welding electrode.
4. The novel coating composition as claimed in claim 1, wherein the E6013
electrode has a carbon steel core wire of diameter of 4mm.
5. The novel coating composition as claimed in claim 1, which used on E6013
electrodes provide toughness value equivalent to E7018 is grater than 27.