A surface coating of non-copper-plated gas shielded welding wire

Abstract

The present invention belongs to the field of surface treatment of copper-free welding wire in the welding wire industry, and in particular, is a surface coating of copper-free gas shielded welding wire. The coating includes two layers, coating 1 and coating 2, wherein coating 1 includes graphene, polytetrafluoroethylene, tungsten disulfide, boron nitride and titanium dioxide; and coating 2 is an anti-rust coating material PROTEC‑WLS04. The welding wire to be coated is continuously drawn for multiple times, and after the diameter of the welding wire is drawn to a diameter of 0.78mm‑5.5mm, coating 1 is installed in a powder coating device, coated by the powder coating device, and then coated by an oil coating device after wiping to prepare a surface coated welding wire. The welding wire has stronger lubrication and conductivity, and effectively reduces the wear of the conductive nozzle under high temperature conditions; during the use of the welding wire, the arc is stable, the spatter is small, the weld is beautifully formed, and the wear of the conductive nozzle is close to that of the copper-plated welding wire, which is better than the industry level.

Description

Technical Field

[0001] The invention belongs to the field of surface treatment of non-copper-plated welding wires in the welding wire industry, in particular to a surface coating of a non-copper-plated gas shielded welding wire. Background Art

[0002] The production process of non-copper-plated welding wire does not involve pickling and copper plating, which is an inevitable product of green production. With the increasing requirements of the country for environmental protection, welding wire manufacturers are gradually transforming to the production of non-copper-plated welding wire. The production mode adopts surface coating to produce welding wire with good anti-rust, conductive and lubricating properties. However, due to the different coating materials of each manufacturer, the processability of non-copper-plated welding wire varies greatly. For example, the main components of the surface coating formula of non-copper-plated welding wire in the existing market are conductive and lubricating components such as molybdenum disulfide, colloidal graphite, polytetrafluoroethylene, titanium nitride, etc., which are mixed and coated with lubricants, anti-rust oils, etc., which affect the stability of the welding process and cause welding process problems such as sudden increase in spatter, abnormal wear of the conductive nozzle, and abnormal weld formation. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a surface coating for a non-copper-plated welding wire. Graphene, polytetrafluoroethylene, tungsten disulfide, boron nitride, and titanium dioxide are mixed in proportion and coated on the surface of the welding wire by friction, which can evenly cover the surface of the welding wire, making the welding wire have stronger lubrication and conductivity, effectively reducing the wear of the conductive tip under high temperature conditions, and after coating, a certain proportion of anti-rust oil is applied to it, so that it has strong anti-rust performance. During the use of the welding wire, the arc is stable, the spatter is small, the weld is beautiful, and the wear of the conductive tip is close to that of the copper-plated welding wire, which is better than the industry level.

[0004] To achieve the above purpose or other purposes, the present invention is implemented through the following technical solutions:

[0005] The present invention provides a surface coating of a copper-free gas shielded welding wire, comprising a coating 1 and a coating 2. The coating 1 comprises the following raw material components and their weight proportions: 10-30 parts of graphene, 10-20 parts of polytetrafluoroethylene, 20-30 parts of tungsten disulfide, 15-25 parts of boron nitride, and 15-25 parts of titanium dioxide; the coating 2 is an anti-rust coating material PROTEC-WLS04.

[0006] Among them, the graphene particle size is 0.5-2 μm, the polytetrafluoroethylene particle size is 8-12 μm, the tungsten disulfide particle size is less than or equal to 0.5 μm, the boron nitride particle size is 6-10 μm, and the titanium dioxide particle size is less than or equal to 0.5 μm.

[0007] The coating 1 of the non-copper-plated gas shielded welding wire is prepared by the following steps: graphene, polytetrafluoroethylene, tungsten disulfide, boron nitride and titanium dioxide are placed in a dry mixer in proportion and stirred and mixed evenly, and then dried after stirring.

[0008] Furthermore, the stirring speed is 100-200 r / min, the stirring time is 20-30 min, and the drying temperature is 50-65°C.

[0009] Wherein, the coating 2 is a welding wire protection liquid WLS04 produced by PROTEC.

[0010] The present invention also provides a method for preparing a surface coating of a copper-free gas shielded welding wire, the steps of which are: the welding wire to be coated is continuously drawn multiple times, and after the welding wire diameter is drawn to a diameter of 0.78mm-5.5mm, the welding wire coating 1 prepared above is installed in a powder coating device, coated by the powder coating device, wiped, and then coated by an oil coating device to prepare a copper-free gas shielded welding wire with a surface coating.

[0011] Among them, the coating weight of coating 1 is 10-50g / ton, the coating weight of coating 2 is 80-150g / ton, and the coating weight of coating 1+coating 2 is 90-200g / ton.

[0012] The beneficial effects of the present invention are:

[0013] (1) Tungsten disulfide has good adhesion to metal surfaces. Adding tungsten disulfide to the coating can enhance the bonding strength between graphene and the welding wire surface, ensuring that the coating is dense and not easy to fall off;

[0014] (2) Graphene has good electrical conductivity and high temperature resistance. Adding graphene can reduce the resistance value of the welding wire surface and reduce the temperature of the conductive tip during welding;

[0015] (3) Polytetrafluoroethylene and titanium dioxide can enhance the lubrication of the welding wire surface and effectively reduce the wear of the conductive nozzle;

[0016] (4) Boron nitride has good high-temperature lubrication effect, reducing the wear of the conductive nozzle under high temperature conditions.

[0017] The coating is designed with the above ratio, and the rust resistance of the produced welding wire is better than that of the copper-plated welding wire. During the welding process, the arc is stable, the spatter is small, the weld is beautifully formed, and the wear rate of the conductive nozzle is small. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0019] Embodiment 1:

[0020] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein, by mass percentage of the coatings, coating 1 includes the following components: 10% graphene, 15% polytetrafluoroethylene, 30% tungsten disulfide, 20% boron nitride, and 25% titanium dioxide.

[0021] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 10g / ton, the coating amount of coating 2 is 80g / ton, and the diameter of the welding wire is 1.2mm.

[0022] Embodiment 2:

[0023] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein the coatings include the following components by mass percentage: 20% graphene, 20% polytetrafluoroethylene, 20% tungsten disulfide, 20% boron nitride, and 20% titanium dioxide.

[0024] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 10g / ton, the coating amount of coating 2 is 100g / ton, and the diameter of the welding wire is 1.2mm.

[0025] Embodiment 3:

[0026] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein the coatings include the following components by mass percentage: 30% graphene, 10% polytetrafluoroethylene, 20% tungsten disulfide, 20% boron nitride, and 20% titanium dioxide.

[0027] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 25g / ton, the coating amount of coating 2 is 120g / ton, and the diameter of the welding wire is 1.2mm.

[0028] Embodiment 4:

[0029] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein the coatings include the following components by mass percentage: 10% graphene, 20% polytetrafluoroethylene, 25% tungsten disulfide, 25% boron nitride, and 20% titanium dioxide.

[0030] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 50g / ton, the coating amount of coating 2 is 150g / ton, and the diameter of the welding wire is 1.2mm.

[0031] Embodiment 5:

[0032] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein the coatings include the following components by mass percentage: 15% graphene, 20% polytetrafluoroethylene, 30% tungsten disulfide, 20% boron nitride, and 15% titanium dioxide.

[0033] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 50g / ton, the coating amount of coating 2 is 90g / ton, and the diameter of the welding wire is 1.2mm.

[0034] Embodiment 6:

[0035] The copper-free welding wire of this embodiment includes a 1.2 mm welding wire to be coated made of ER70S-6 material and coatings 1 and 2 coated on the surface of the welding wire, wherein the coatings include the following components by mass percentage: 20% graphene, 10% polytetrafluoroethylene, 20% tungsten disulfide, 25% boron nitride, and 25% titanium dioxide.

[0036] ER70S-6 1.2mm welding wire to be coated is conventionally drawn, surface cleaned and dried, and the coating is mixed and evenly coated on the surface of the welding wire to obtain the welding wire. The coating amount of coating 1 is 10g / ton, the coating amount of coating 2 is 150g / ton, and the diameter of the welding wire is 1.2mm.

[0037] Various welding tests were conducted on the copper-free welding wires of the above-mentioned embodiments 1 to 6 according to relevant standards and specifications. The welding process parameters are shown in Table 1 below, and the welding performance is shown in Table 2 below.

[0038] Table 1: Welding process parameters

[0039] Voltage Current gas Welding speed Stem elongation Welding time 30V 280A 8%CO2+92%Ar 6mm / S 15mm 20min

[0040] Table 2: Welding process performance

[0041]

[0042] Contact nozzle wear rate: m0 is the initial weight of the conductive tip, and m1 is the weight of the conductive tip after spatter removal after 20 minutes of continuous welding.

[0043] Wire feeding performance: Wrap a 5-meter welding wire hose into a 20-cm circle. If it can be welded under two-circle test conditions, it is fair; if it can be welded under three-circle test conditions, it is excellent.

[0044] Arc stability: Evaluated by feedback of current and voltage stability through a high-speed camera system.

[0045] Smoke volume: The smoke volatilized from the surface of the welding wire is tested under the conditions of voltage 10V and current 30A, and evaluated through the smoke comparison chart. Spatter volume: Fillet welds are welded under the same welding process parameters, and the spatter volume of fillet welds of the same length is evaluated.

[0046] The test results of Examples 1 to 6 show that the surface coating of the present invention has a lower wear rate of the conductive tip during welding, good wire feedability and arc stability, and the comprehensive performance of smoke and spatter is better than that of non-copper-plated welding wire and copper-plated welding wire of some manufacturers.

[0047] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A surface coating of a non-copper-plated gas shielded welding wire, characterized in that: It includes coating 1 and coating 2, wherein coating 1 includes the following raw material components and mass percentages: 10-30% graphene, 10-20% polytetrafluoroethylene, 20-30% tungsten disulfide, 20-25% boron nitride, and 15-25% titanium dioxide; coating 2 is the anti-rust coating material PROTEC-WLS04; The particle size of the graphene is 0.5-2 μm, the particle size of the polytetrafluoroethylene is 8-12 μm, the particle size of the tungsten disulfide is less than or equal to 0.5 μm, the particle size of the boron nitride is 6-10 μm, and the particle size of the titanium dioxide is less than or equal to 0.5 μm.

2. The surface coating of the non-copper-plated gas shielded welding wire according to claim 1, characterized in that: The coating 1 of the copper-free gas shielded welding wire is prepared by the following steps: graphene, polytetrafluoroethylene, tungsten disulfide, boron nitride and titanium dioxide are placed in a dry mixer according to proportions, stirred and mixed evenly, and then dried after stirring.

3. The surface coating of the non-copper-plated gas shielded welding wire according to claim 2, characterized in that: The stirring speed is 100-200r / min, the stirring time is 20-30min, and the drying temperature is 50-65℃.

4. The surface coating of the non-copper-plated gas shielded welding wire according to claim 1, characterized in that: The coating 2 is a welding wire protection liquid WLS04 produced by PROTEC.

5. The method for preparing the surface coating of the non-copper-plated gas shielded welding wire according to any one of claims 1 to 4, characterized in that: The steps are: The welding wire to be coated is continuously drawn for multiple times, and after the welding wire diameter is drawn to a diameter of 0.78mm-5.5mm, the welding wire coating 1 prepared according to claim 3 is installed in a powder coating device, coated by the powder coating device, wiped and then coated by an oil coating device, to prepare a copper-free gas shielded welding wire with a surface coating.

6. The preparation method according to claim 5, characterized in that: The coating weight of coating 1 is 10-50 g / ton, the coating weight of coating 2 is 80-150 g / ton, and the coating weight of coating 1 + coating 2 is 90-200 g / ton.

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