CN115555760B - A copper-free welding wire and its coating and preparation method - Google Patents
A copper-free welding wire and its coating and preparation method Download PDFInfo
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- CN115555760B CN115555760B CN202211320835.6A CN202211320835A CN115555760B CN 115555760 B CN115555760 B CN 115555760B CN 202211320835 A CN202211320835 A CN 202211320835A CN 115555760 B CN115555760 B CN 115555760B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention provides a copper-free welding wire, a coating thereof and a preparation method thereof, and particularly relates to the field of welding materials. The copper-plated welding wire coating is characterized by comprising, by mass, 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride. The copper-plated welding wire coating is compact and not easy to fall off, has good wire feeding stability, small abrasion of the contact tip, simple process production and greatly reduced cost.
Description
Technical Field
The invention relates to the field of welding materials, in particular to a copper-free welding wire, a coating thereof and a preparation method thereof.
Background
With the increasing degree of application of copper-free welding wires in the market in recent years, the copper-free welding wires gradually replace copper-plated welding wires. The copper plating process is omitted in the production of the welding wire without copper plating, and the surface coating is utilized to replace the original copper plating layer, so that the welding wire meets the welding process requirements in the aspects of conductivity, rust prevention, lubrication and the like, and meanwhile, the welding wire without copper plating is energy-saving and environment-friendly in the production and use processes, and the working environment is greatly improved. Compared with copper-plated welding wires, the domestic copper-plated welding wires have several problems, namely complex process and high cost of the copper-plated welding wire coating, non-compact surface coating of the copper-plated welding wires, easy falling, unsmooth wire feeding in the welding process and blockage of a wire feeding system in welding equipment in the using process due to the falling coating, and serious abrasion of a conducting nozzle.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention provides a copper-plated welding wire, a coating and a preparation method thereof, so as to solve the problems of high preparation cost, non-compact coating and serious wear of a contact tip of the coated welding wire.
In order to achieve the above aim and other related aims, the invention provides a copper-free welding wire coating, which comprises 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
In one example of the present invention, the stearate is either or both of calcium stearate and sodium stearate.
In an example of the present invention, the particle size of the molybdenum disulfide is less than or equal to 0.5 μm, the particle size of the colloidal graphite is 1 to 10 μm, and the particle size of the titanium nitride is 1 to 10 μm.
The invention provides a copper-plated welding wire which comprises a wire rod and a coating, wherein the coating comprises, by mass, 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
In one example of the present invention, the weight of the coating in the copper-free welding wire is 0.01-0.05% of the total weight of the copper-free welding wire.
In an example of the invention, the wire rod is an ER50-6 wire rod, and the diameter of the wire rod is 5.5-6.5 mm.
In one example of the invention, the diameter of the copper-free welding wire is 0.8-1.6 mm.
The invention provides a preparation method of a copper-free welding wire, which comprises the following steps of providing a wire rod, uniformly mixing the components to prepare a coating, mechanically peeling the wire rod, removing rust, roughening, coating the prepared coating on the wire rod, compressing and coating the coating, and drawing for multiple times to obtain the copper-free welding wire.
In an example of the invention, during the rust removing roughening treatment, the wire rod is sequentially subjected to the rust removing roughening treatment by using a first yarn cloth belt and a second yarn cloth belt, wherein the mesh number of the first sand cloth belt is 30-50 meshes, and the mesh number of the second sand cloth belt is 50-80 meshes.
In one example of the invention, the surface of the welding wire is coated with a lubricant during the drawing process.
The coated welding wire can improve the smoothness of welding wire drawing by adding stearate and polytetrafluoroethylene into the coating, improve the production efficiency and reduce the cost, molybdenum disulfide has good metal surface adhesion, molybdenum disulfide and colloidal graphite are added into the coating to enhance the bonding strength of the coating and a wire rod, ensure that the coating is compact and is not easy to fall off, the conductivity of the molybdenum disulfide and the colloidal graphite is good and high-temperature resistant, the resistance value of the surface of the welding wire can be reduced by adding the molybdenum disulfide and the colloidal graphite, the temperature of a contact tip during welding is reduced, and the abrasion of the contact tip can be effectively reduced by adding the titanium nitride.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a copper-free welding wire.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.
It should be noted that "%" and "wt%" in the present specification represent mass%.
The invention provides a copper-plated welding wire, a coating and a preparation method thereof, wherein the coating of the copper-plated welding wire is compact and is not easy to fall off, and the abrasion of a conductive nozzle is small, so that the copper-plated welding wire has great practical value.
The copper-plating-free welding wire coating comprises, by mass, 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
The functions of the components in the coating are as follows:
stearate is used as a lubricating carrier, so that the smoothness of drawing of the coated welding wire can be improved, and meanwhile, the wire feeding stability and the arc stability of the welding wire can be improved. In the present invention, the mass percentage of the stearate is 70 to 80%, for example, the mass percentage of the stearate may be any value in the range of 70 to 80%, such as 70%, 73%, 78% or 80%. In the invention, the stearate is any one or two of calcium stearate and sodium stearate.
The molybdenum disulfide improves the conductivity, reduces the surface resistance value of the welding wire, and enhances the bonding strength of the coating and the welding wire matrix. In the invention, the mass percentage of the molybdenum disulfide is 10-20%, for example, the mass percentage of the molybdenum disulfide can be any value within the range of 10% -20% such as 10%, 15% or 20%.
And the colloidal graphite improves the conductivity of the coating and reduces the surface resistance value of the welding wire. In the invention, the mass percentage of the colloidal graphite is 3-5%, for example, the mass percentage of the colloidal graphite can be any value in the range of 3-5%, such as 3%, 4% or 5%.
And the polytetrafluoroethylene is lubricated, so that the drawing resistance and the wire feeding resistance in the welding process are reduced. In the present invention, the mass percentage of polytetrafluoroethylene is 1 to 2%, for example, the mass percentage of polytetrafluoroethylene may be any value within the range of 1 to 2%, such as 1%, 1.5% or 2%.
Titanium nitride, which improves the conductivity of the coating and reduces the abrasion of the contact tip. In the present invention, the mass percentage of titanium nitride is 6 to 10%, for example, the mass percentage of titanium nitride may be any value within the range of 6 to 10%, such as 6%, 7.5%, 9% or 10%.
In one embodiment, the particle size of molybdenum disulfide is 0.5 μm or less, the particle size of the colloidal graphite is 1 to 10 μm, the particle size of the titanium nitride is 1 to 10 μm, for example, the particle size of the colloidal graphite may be any value in the range of 1 to 10 μm such as 1 μm, 5 μm, 8 μm or 10 μm, and the particle size of the titanium nitride may be any value in the range of 1 to 10 μm such as 1 μm, 3 μm, 8 μm or 10 μm.
The copper-plating-free welding wire comprises a wire rod and a coating, wherein the coating comprises 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
In an embodiment, the coating rate of the coating in the coated welding wire, that is, the weight of the coating is 0.01-0.05% of the total weight of the coated welding wire, for example, the coating rate of the coating may be any value ranging from 0.01% to 0.05%, such as 0.02%, 0.04%, 0.05%, etc.
In an embodiment, the wire rod of the coated welding wire adopts an ER50-6 wire rod, the diameter of the wire rod is 5.5-6.5 mm, for example, the diameter of the wire rod can be any value in the range of 5.5-6.5 mm, such as 5.5mm, 6mm or 6.5 mm.
In one embodiment, the diameter of the coated welding wire is 0.8-1.6 mm, for example, the diameter of the coated welding wire may be any value within the range of 0.8-1.6 mm, such as 0.8mm, 1.1mm, 1.3mm, or 1.6 mm.
Referring to fig. 1, the invention provides a method for preparing a copper-free welding wire, which comprises the following steps:
s1, providing a wire rod;
S2, uniformly mixing the components of the coating according to the proportion;
S3, mechanically shelling the wire rod, and carrying out rust removal roughening treatment;
S4, coating the prepared coating on the wire rod, and compressing the coating;
s5, drawing for multiple times to obtain the copper-free welding wire.
In the step S1, the wire rod is ER50-6 wire rod, the diameter of the wire rod is 5.5-6.5 mm, for example, the diameter of the wire rod can be any value within the range of 5.5-6.5 mm, such as 5.5mm, 6mm or 6.5 mm.
In the step S2, the components in the coating are uniformly mixed and stirred according to the proportion of 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
In step S3, firstly, the wire rod is mechanically shelled, and then the shelled wire rod is subjected to rust removal and roughening treatment. The first yarn cloth belt and the second yarn cloth belt are sequentially used for carrying out wire rod treatment during roughening treatment, the mesh number of the first yarn cloth belt is 30-50 meshes, the mesh number of the second yarn cloth belt is 50-80 meshes, for example, the mesh number of the first yarn cloth belt can be any value in the range of 30-50 meshes, such as 30-mesh, 40-mesh or 50-mesh, and the mesh number of the second yarn cloth belt can be any value in the range of 50-80 meshes, such as 50-mesh, 60-mesh, 70-mesh or 80-mesh. The roughening treatment is carried out on the wire rod, so that the roughness of the wire rod can be improved, the bonding strength of the coating and the wire rod is enhanced, and the coating is compact and is not easy to fall off.
In the step S4, the prepared coating is coated on the surface of the wire rod, the wire rod coated with the coating is put into a die for drawing, and the coating is extruded and firm on the surface of the wire rod in the drawing process.
In step S5, the lubrication degree of the drawing process may be increased by using the lubricant powder, so that the drawing is smoother.
According to the preparation method of the copper-free welding wire, the coating is coated on the surface of the wire rod before the first drawing, then the wire rod is drawn, and after that, when the wire rod coated with the coating is drawn, the lubricating powder is coated for drawing so as to improve the smoothness of drawing. Because the molybdenum disulfide, the colloidal graphite and other components are added in the coating, the coating can form a layer of compact and uniform film on the surface of the wire rod, isolate the wire rod from the lubricating powder, and can easily wipe the lubricating powder after drawing is finished, so that the surface of the welding wire coating is smooth and clean, compact and low in falling rate.
The invention is described in detail below by means of some specific examples. The drugs used in the following examples are all available by general commercial means.
Example 1
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 70% of calcium stearate, 20% of molybdenum disulfide, 3% of colloidal graphite, 1% of polytetrafluoroethylene and 6% of titanium nitride. The wire rod is made of ER50-6 wire rod with the diameter of 6.5mm, after roughening treatment is carried out on the wire rod by sequentially using a first 30-mesh yarn cloth belt and a second 50-mesh yarn cloth belt, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating was 0.049% and the diameter of the welding wire was 1.6mm.
Example 2
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 80% of sodium stearate, 10% of molybdenum disulfide, 3% of colloidal graphite, 1% of polytetrafluoroethylene and 6% of titanium nitride. The wire rod is made of ER50-6 wire rods with the diameter of 6.5mm, the wire rod is roughened by sequentially using a first 40-mesh yarn cloth belt and a second 60-mesh yarn cloth belt, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple drawing. The coating rate of the coating is 0.035%, and the diameter of the welding wire is 1.2mm.
Example 3
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 75% of stearate (15% of calcium stearate, 60% of sodium stearate), 15% of molybdenum disulfide, 3% of colloidal graphite, 1% of polytetrafluoroethylene and 6% of titanium nitride. The wire rod is made of ER50-6 wire rod with the diameter of 6.5mm, the wire rod is roughened by sequentially using a first yarn cloth belt with the diameter of 50 meshes and a second yarn cloth belt with the diameter of 80 meshes, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating is 0.021, and the diameter of the welding wire is 1.2mm.
Example 4
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 70% of stearate (wherein calcium stearate is 10%, sodium stearate is 60%), 14% of molybdenum disulfide, 5% of colloidal graphite, 1% of polytetrafluoroethylene and 10% of titanium nitride. The wire rod is made of ER50-6 wire rod with the diameter of 6.5mm, the wire rod is roughened by sequentially using a first yarn cloth belt with the diameter of 50 meshes and a second yarn cloth belt with the diameter of 70 meshes, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating was 0.022, and the diameter of the welding wire was 1.2mm.
Example 5
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 70% of stearate (wherein calcium stearate is 20%, sodium stearate is 50%), 18% of molybdenum disulfide, 4% of colloidal graphite, 2% of polytetrafluoroethylene and 6% of titanium nitride. The wire rod is made of ER50-6 wire rod with the diameter of 6.5mm, the wire rod is roughened by sequentially using a first 40-mesh yarn cloth belt and a second 80-mesh yarn cloth belt, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating was 0.048% and the diameter of the welding wire was 1.2mm.
Example 6
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 75% of stearate (calcium stearate 20%, sodium stearate 55%), 11% of molybdenum disulfide, 4% of colloidal graphite, 2% of polytetrafluoroethylene and 8% of titanium nitride. The wire rod is made of ER50-6 wire rods with the diameter of 5.5mm, the wire rod is roughened by sequentially using a first yarn cloth belt with the diameter of 50 meshes and a second yarn cloth belt with the diameter of 80 meshes, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating is 0.01%, and the diameter of the welding wire is 0.8mm.
Example 7
The copper-free welding wire comprises a wire rod and a coating coated on the surface of the wire rod, wherein the coating comprises, by mass, 72% of stearate (36% of calcium stearate, 36% of sodium stearate), 14% of molybdenum disulfide, 4% of colloidal graphite, 2% of polytetrafluoroethylene and 8% of titanium nitride. The wire rod is made of ER50-6 wire rods with the diameter of 5.5mm, the wire rod is roughened by sequentially using a first 40-mesh yarn cloth belt and a second 80-mesh yarn cloth belt, the coating is uniformly mixed and coated on the surface of the wire rod, the coating is compressed and coated, and the welding wire is obtained after multiple pulling. The coating rate of the coating is 0.015 percent, and the diameter of the welding wire is 1.0mm.
Each welding test was performed on the copper-free welding wires of examples 1 to 7 described above according to the relevant standard specifications. The welding process parameters are shown in table 1 below, and the welding performance is shown in table 2 below.
TABLE 1 welding process parameters
TABLE 2 welding process performance
The test results of examples 1 to 7 show that the copper-free welding wire provided by the invention has the advantages of smaller wear rate of the contact tip during welding, good wire feeding property and arc stability, and better comprehensive performance than the commercial copper-free welding wire and copper-free welding wire.
The copper-plated welding wire can improve the smoothness of welding wire drawing and production efficiency by adding stearate and polytetrafluoroethylene into the coating, molybdenum disulfide has good metal surface adhesion, the bonding strength of the coating and a wire rod can be enhanced by adding molybdenum disulfide and colloidal graphite into the coating, the coating is compact and is not easy to fall off, the conductivity of the molybdenum disulfide and the colloidal graphite is good and high-temperature resistant, the resistance value of the surface of the welding wire can be reduced by adding the molybdenum disulfide and the colloidal graphite, the temperature of a conductive nozzle during welding is reduced, the abrasion of the conductive nozzle can be effectively reduced by adding the titanium nitride, the preparation process is simple, the cost can be greatly reduced, and the industrial production is facilitated. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. The copper-plating-free welding wire coating is characterized by comprising, by mass, 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
2. The copper-free welding wire coating of claim 1, wherein the stearate is either or both of calcium stearate and sodium stearate.
3. The copper-free welding wire coating according to claim 1, wherein the particle size of the molybdenum disulfide is less than or equal to 0.5 μm, the particle size of the colloidal graphite is 1-10 μm, and the particle size of the titanium nitride is 1-10 μm.
4. The copper-plating-free welding wire is characterized by comprising, by mass, 70-80% of stearate, 10-20% of molybdenum disulfide, 3-5% of colloidal graphite, 1-2% of polytetrafluoroethylene and 6-10% of titanium nitride.
5. The copper-free welding wire according to claim 4, wherein the weight of the coating in the copper-free welding wire is 0.01-0.05% of the total weight of the copper-free welding wire.
6. The copper-free welding wire of claim 4, wherein the wire rod is an ER50-6 wire rod, and the diameter of the wire rod is 5.5-6.5 mm.
7. The copper-free welding wire according to claim 4, wherein the copper-free welding wire has a diameter of 0.8-1.6 mm.
8. The preparation method of the copper-free welding wire is characterized by comprising the following steps of:
providing a wire rod;
The components of claim 1 are mixed uniformly to provide a coating;
mechanically shelling the wire rod, and carrying out rust removal roughening treatment;
Coating the prepared coating on the wire rod, and compressing the coating;
and (5) drawing for multiple times to obtain the copper-free welding wire.
9. The method for producing a copper-free solder wire according to claim 8, wherein the wire rod is roughened by sequentially removing rust with a first gauze and a second gauze, the number of the first gauze being 30 to 50 mesh, and the number of the second gauze being 50 to 80 mesh.
10. The method of producing a copper-free welding wire according to claim 8, wherein the surface of the welding wire is coated with a lubricant during the drawing.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102844149A (en) * | 2010-04-02 | 2012-12-26 | 林肯环球股份有限公司 | Feeding lubricant for cored welding electrode, cored welding electrode and gmaw process |
| CN108941979A (en) * | 2018-09-05 | 2018-12-07 | 天津市永昌焊丝有限公司 | A kind of no copper facing ER50-6 gas shielded solid welding wire |
| CN114769944A (en) * | 2022-01-17 | 2022-07-22 | 许毅 | Copper-plating-free nano-coating welding wire and processing technology thereof |
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| DE102005059614A1 (en) * | 2005-12-12 | 2007-06-14 | Nano-X Gmbh | Anti-corrosion and/or anti-scaling coating for metals (especially steel) is applied by wet methods and heat treated to give a weldable coating |
| CN109836855A (en) * | 2017-09-28 | 2019-06-04 | 南京龙贞自控科技发展有限公司 | A kind of anticorrosive hydraulic pressure vulcanizing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102844149A (en) * | 2010-04-02 | 2012-12-26 | 林肯环球股份有限公司 | Feeding lubricant for cored welding electrode, cored welding electrode and gmaw process |
| CN108941979A (en) * | 2018-09-05 | 2018-12-07 | 天津市永昌焊丝有限公司 | A kind of no copper facing ER50-6 gas shielded solid welding wire |
| CN114769944A (en) * | 2022-01-17 | 2022-07-22 | 许毅 | Copper-plating-free nano-coating welding wire and processing technology thereof |
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