FIELD OF THE INVENTION
00001. The present invention relates to a novel coating composition for E70XX
series SMAW electrodes, or more specially E7016 welding electrodes where the
coating is tinkered with some micro alloying elements along with the flux
components which provides higher toughness and mechanical strength.
BACKGROUND OF THE INVENTION
2. E70XX series SMAW electrodes are very commonly used for welding of carbon steels in various fields like boiler and structural applications. These electrodes are actually basic coated electrodes which warrants very less hydrogen content in the weld metal deposited by them.
3. E70XX electrodes as recommended by AWS SFA-5.1 meets this toughness requirement mentioned in it i.e. value should be greater than 27 Joules at -30°C.Many electrode manufacturers have been successful in achieving toughness higher than mentioned above, whereas only few manufactures have been able to report a toughness more than 60 joules. The toughness values mentioned here is more than the 60 joules (Average) above still no one has achieved and reported the toughness, with and without treatment and this significantly higher toughness is reported in this patent.
PRIOR ART
1) US2013294820
00004. A weld deposit produced from a coated welding electrode for use in
welding cast irons is provided by the present invention. Preferably, in one form
of the present invention, the weld deposit composition comprises between

approximately 54% and approximately 60% Nickel, between approximately 3.5% and approximately 5.5% Manganese, and between approximately 0.9% and approximately 1.4% Carbon. The weld deposit is preferably formed by using a coated welding electrode having a coating composition between approximately 0.3% and approximately 4.0% Magnesium and rare earth metals and oxides. The resulting weld deposit exhibits improved ductility, fracture toughness, and resistance to cracking.
2) RU94022882
00005. Welding materials applicable in welding in various spatial positions of low-carbon and low-alloy steels. SUBSTANCE: the electrode coating contains, mas. Max %: ilmenite ore containing 8-15% of titanium oxide 26-36; marble 11-15; ferro-manganese 15-20; ferro-titanium 5-10; quartz sand 20-30; kaolin 6-10; wood flour 1.5-2.0; soda ash 0.5-1.5. In this case, wood flour, kaolin and marble should be taken in the ratio of 1:(4.0-5.0):(7.0-7.5). The offered electrode coating makes it possible together with considerable cutting down of its cost to obtain good welding and technological characteristics in welding low-carbon and low-alloy steels in any spatial positions. This is achieved due to application in the composition of electrode coating of low price ilmenite ore of the Aldan region with content of titanium oxide amounting up to 8-15% and combination of optimal ratio of wood fluor: kaolin: marble= 1: (4.0-5.0): (7.0-7.5) with content of the other components of the coating within the range offered by the present invention. Application of the given coating for electrodes makes it possible to obtain the mechanical properties of the weld seam corresponding to the E46 type, that is, applicable in welding of vital structures of low-carbon steels. EFFECT: higher efficiency. 3 tbl.

3) JP2004115911
6. To provide low Cr, i.e. inexpensive ferritic stainless steel which solves the problem as for external corrosion resistance in a salt damage environment in the conventional technique on using ferritic stainless steel after working and welding into an automobile fuel tank, fuel pipe or the like. ;SOLUTION: The Zn-containing paint coated ferritic stainless steel is obtained by coating ferritic stainless steel comprising alloy elements having the following specified composition with a Zn-containing paint. The specified composition comprises, by mass, <=0.1% C, <=1.0% Si, <=1.5% Mn, <=0.06% P, <=0.03% S, <=1.0% Al, 11 to 20% Cr and <=0.04% N, also comprises 0.002 to 0.8% Nb and/or 0.01 to 1.0% Ti, and the balance Fe with inevitable impurities.
7. The formulation of electrode coating for E7016 is widely available. Indigenously there are many electrode manufacturers who have the formulation which can meet the minimum requirement of AWS section II-C SFA-5.1.

8. But a higher toughness is always beneficial for achieving recommended higher strength level. Achieving higher toughness is always accompanied with loss of strength in both weld metals which are heat treated or not.
9. But this could be achieved by tinkering the coating formulation. However achieving and maintaining both is very challenging as it requires lot of iterations to get the desired combination.
000010. The formulation of electrode coating for E7016 is widely available.
Indigenously there are many electrode manufacturers who have the formulation
which can meet the minimum requirement of AWS section II-C SFA-5.1. But still
there are no electrode manufacturers who can come up with this formulation of

E7016 which can yield better enhanced toughness along with high strength levels.
000011. The present invention meets the long felt need.
OBJECTS OF THE INVENTION
12. It is therefore the principal object of the present invention is to provide a coating composition of electrode, which provides higher mechanical toughness along with mechanical strength.
13. Another object of the present invention is to provide a coating composition, which is useful for a specific electrode such as E7016 SMAW (Shielded Metal Arc Welding) which can achieve high toughness at required strength levels as per AWS SFA 5.1.
14. Another object of the present invention is to provide a coating composition which has achieve a toughness value or more than 60 joules, which was not reported earlier.

15. Yet another object of the present invention is to provide a coating composition, which can produce a flux system to produce better strength and higher toughness combination.
16. Further object of the present invention is to provide a coating composition, which is simple, cost effective yet environment friendly.

SUMMARY OF THE INVENTION
17. A novel coating composition of an electrode to be used for metal are welding of the ferritic steels in welding application comprises micro alloying elements along with the flux components such as limestone, fluorspar, titanium dioxide rutile, feldspar, ferrosilicon, ferromanganese, sodium silicate, potassium silicate, boron and titanium.
18. Characterized in that all the ingredients provide acicular ferrite in the weld metal with lot of interfaces in the micro structure to produce high toughness and mechanical strength.
19. Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures.
20. 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.
21. 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
000022. 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.
000023. 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 of an electrode. Such a method for evaluating the same may vary
based on configuration of one or more work pieces. However, such modifications
should be construed within the scope of the disclosure. Accordingly, the
drawings illustrate only those specific details that are pertinent to understand
the embodiments of the present disclosure, so as not to obscure the disclosure
with details that will be clear to those of ordinary skill in the art having benefit
of the description herein.
000024. 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.
000025. 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.
26. The present subject matter relates to a novel coating composition to be used for a specific electrode i.e. E7016 electrode for providing high mechanical strength along with substantially high toughness or higher V-notch toughness.
27. The higher toughness is achieved with mechanical strength when the coating of electrode is tinkered with some micro alloying elements along with the flux components present in the electrode covering
28. The tinkered coating composition is given below in table 1:Values in %

Table 1
Limestone 15-30 wt%
Fluorspar 15-30 wt%
Titanium dioxide rutile 15-30 wt%
Feldspar 0-5 wt%
Ferrosilicon 5-10 wt%
Ferromanganese 2-6 wt%
Sodium silicate 0-5 wt%
Potassium silicate 5-10 wt%
000029. The formulation of the electrode coating is designed in such a way
25 that it produces acicular ferrite in the weld metal. This acicular ferrite with lot
of interfaces in the micro structure produces higher toughness and higher mechanical strength.

30. The electrode coating for E7016 electrode produce better strength and higher toughness. This composition is achieved even after multiple heat treatments and in as welded condition.
31. The electrode coating is designed and formulated in such a way that it produces acicular ferrite with increased interfaces in the micro structure due to addition of micro alloying elements like Boron and Titanium. This acicular ferrite in microstructure is responsible for enhanced charpy-V notch toughness values and better strength in this weld metals. The higher values of toughness and mechanical strength is achieved due to alloying of B and Ti in this electrode coating along with this other flux components.

32. In accordance with the another embodiment of the present invention, a specific electrode is selected i.e. E7016, which is a SMAW welding electrode.
33. It is nomenclature as per SFA 5.1 Section II C / AWS. Section II C SFA 5.1 defines this electrode in terms of its chemical properties and mechanical properties.
34. The chemical properties of the electrode is are given in table 2:

Table 2
C Si Mn P S Cr Mo Ni V
0.15 0.75 1.60 0.035 0.035 0.20 0.30 0.30 0.08
]

000035. The mechanical properties of the electrode is are given below in table 3:

Table 3
YS 400 UTS %EL

490 22
000036. The toughness properties are given in table 4 :

Table 4
Average Min Single value Min
27 J at -30 degree C 20 J at -30 degree C
37. 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 r10eferences 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.
38. 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.

000039. The present disclosure provides a eutectic composition for
thermoelectric reverse power generator.
Equivalents:
40. 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.
41. 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).
42. 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.
43. 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.
44. 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 an electrode to be used for metal are welding
of the ferritic steels in welding application comprises micro alloying elements
along with the flux components such as limestone, fluorspar, titanium dioxide
rutile, feldspar, ferrosilicon, ferromanganese, sodium silicate, potassium silicate,
boron and titanium.
Characterized in that all the ingredients provide acicular ferrite in the weld metal with lot of interfaces in the micro structure to produce high toughness and mechanical strength.
2. The novel coating composition as claimed in claim 1, wherein the quantity of
micro allying elements and flux components are given below:
Limestone - 15-30 wt%
fluorspar - 15-30 wt%
titanium dioxide rutile - 15-30 wt%
feldspar - 0-5 wt%
ferrosilicon - 5-10 wt%
ferromanganese - 2-6 wt%
sodium silicate - 0-5 wt%
potassium silicate - 5-10 wt%
Boron - 1-2 wt%
Titanium - 2-5 wt%
Dated this 19th day of December 2018
(DR.(MRS.) I.BANERJEE) IN/PA-211 Of L.S. DAVAR & CO. Applicant’s Agent