JPH0280492A - Welding tip or nozzle - Google Patents

Abstract

PURPOSE:To obtain a welding tip or nozzle excellent in abrasion resistance and spattering resistance by coating the outside and inside of a tip or nozzle with a coating film of a material formed by dispersing a specified fine powder in a copper/copper alloy matrix metal. CONSTITUTION:The inside and outside of a copper/copper alloy arc welding tip or nozzle are coated with a film of a composite material formed by homogeneously dispersing a fine powder comprising either at least one lubricant selected from among hexagonal boron nitride, molybdenum sulfide, tungsten sulfide, graphite and graphite fluoride or both of at least one of said lubricants and at least one abrasion-resistant material selected from among silicon nitride, aluminum nitride, cubic boron nitride, titanium nitride, alumina, zirconia and tungsten carbide in a copper/copper alloy matrix metal.

Description

[Detailed description of the invention] The welding tip used for automatic welding and semi-automatic welding is a part of the torch configuration that is extremely important for stable feeding of welding wire and supplying stable voltage to the welding wire. It is. Traditionally, arc welding tips have been made of copper and copper alloy materials, which have excellent electrical and thermal conductivity, but since they are relatively soft metals, the wire feeding port of the tip has wears away, causing enlargement and deformation of the through hole. This not only makes it impossible to feed the wire steadily, but also leads to accidents such as insufficient penetration due to poor continuity and spark melting between the tip and the wire, which significantly reduces the reliability and productivity of welding work. In addition, during continuous welding, the tip of the nozzle and tip is heated to about 600-700℃ due to side radiation during welding, resulting in a state where fine metal particles (hereinafter referred to as spatter) easily adhere to the nozzle and tip. The accumulated spatter can cause various troubles during welding work, such as disrupting the flow of shielding gas and interfering with stable wire feeding. The present invention provides a welding tip with excellent wear resistance and spatter resistance without impairing the electrical conductivity and thermal conductivity required for arc welding tips, and a nozzle with excellent spatter resistance. This is a very significant invention in terms of preventing such troubles, improving quality and productivity, and further saving labor, and the details will be described below.

Copper and copper alloys were selected for the IJ Lux family because copper and copper alloys are good conductors of electricity and heat. This is because it satisfies the following required conditions. In other words, the chip always supplies a stable voltage to the wire, and the radiant heat during welding and the frictional heat when the wire passes through it quickly diffuses, so the chip is less susceptible to thermal deterioration and is less prone to spatter. Similarly, in the nozzle, the excellent thermal conductivity of this matrix metal is effective in instantaneously cooling the flying spatter, which has a great effect in preventing the spatter from adhering to the nozzle. On the other hand, these fine powders, which are uniformly dispersed as a lubricating component in the matrix metal, are difficult to wet with various metal melts and have excellent mold releasability and lubricating properties, so they provide the following functions. In other words, conventionally, in order to prevent spatter adhesion, it was necessary to apply various types of spatter adhesion preventive agents to the tip and nozzle at regular welding intervals, but this method has not been applied to copper/copper alloys.
The excellent properties of these lubricating components, which are uniformly dispersed in IJ socks, fully play their role, so they exhibit good spatter resistance and prevent spatter adhesion without the need to apply any spatter adhesion prevention agent. Prevent related troubles.

Furthermore, this excellent lubrication property reduces the frictional resistance when the wire slides through the tip through hole, allowing smooth wire feeding and significantly improving the wear resistance of the tip through hole. Improve your skills. Next is the wear-resistant fine powder that is uniformly dispersed in the copper/copper alloy, and its main purpose is to prevent wear of the chip through-hole through which the forcibly fed wire passes. The use of the aforementioned lubricants alone achieves this primary purpose to a large extent, but their use in combination with anti-wear agents increases wear resistance even further and extends the life of the insert. It prevents troubles such as poor conduction, poor penetration, and spark damage between chips and wires, stabilizes quality, and also improves productivity by reducing the troublesome work when replacing chips. The fine powder of these anti-wear agents uniformly dispersed in IJ Lux improves the wear resistance of the tip and extends its life. Its properties such as excellent hardness, high strength, and thermal shock are effective in protecting the nozzle from sputter impact. What you need to be careful about when using an anti-wear agent is to consider the particle size, shape, degree of filling in the matrix metal, etc. If the selection is incorrect, it may damage the wire and prevent smooth feeding. They must be handled with particular care, as they can cause problems.

In addition, the reason why the lubricant and anti-wear powder is limited to fine powder is that
This improves the uniform dispersion of the copper/steel alloy material and makes it possible to fill it with high density.
This is important in fully bringing out the physical properties required for the nozzle. It is clear from the above that the arc welding tips and nozzles treated with the coating made of the composite material of the present invention and the arc welding tips and nozzles made by sintering and molding this composite material do not impair electrical conduction. (It significantly improves the spatter resistance and the wear resistance of the wire feeding path, improves quality by preventing various troubles associated with spatter adhesion, and eliminates the need to apply spatter adhesion prevention agents. It also reduces the troublesome work required to replace chips, which greatly contributes to labor savings and improved productivity.Coatings and sintered molds made of these composite materials can be prepared by thermal spraying, dispersion plating (electrolytic and electroless plating). ), hot pressing, etc., but from the standpoint of quality stability and economical evaluation, the method using dispersion plating seems to be the most suitable at present.Examples will now be described.

Example (1) Graphite fine powder with a particle size range of 0 to 4μ was electrolytically treated for 60 minutes at a DK of 2A/dm2 and a bath temperature of 60°C from a blued steel bath in which it was uniformly dispersed using an air blower and liquid circulation. A sample was prepared by coating the inner and outer surfaces of a copper nozzle and tip with 25 μm graphite sacrificial copper plating. This sample was welded under the welding conditions of 23 V and 230 A without using a spatter adhesion inhibitor.
When the tip through hole of the φ wire 45 was observed after the odor was consumed, no damage due to abrasion was observed, and there was no problem of spatter adhering to the tip or nozzle which would impede welding work. As a result of analysis, the amount of graphite in the coating treated with graphite-dispersed steel plating was 19.8.
It was N.

Example (2) Fine powder of h-BN consisting of a particle size range of 0 to 7μ and ZrO2 consisting of a particle size range of 0 to 4p was uniformly dispersed using an air blower and liquid circulation. 1)
Under the same plating conditions and electrolytically treated, 22μ h-BN,
The sample is a copper tip whose inner and outer surfaces are coated with ZrO2 composite dispersed steel plating. No spatter adhesion prevention agent was applied to this sample, and the welding conditions were 28V and 270A.
．． After consuming 65 kg of 2φ wire, no wear that would impede welding or trouble associated with removal of spatter was observed in the tip through hole, and stable welding was always obtained. As a result of analysis, the h-BN and ZrO2 contents in the dispersion plating film were 19.5 volN and 2 volN, respectively.

Example (3) When we observed the tip through hole after consuming 25Kf of 1.2φ wire under welding conditions of 28V, 270Af while periodically applying a spatter adhesion prevention agent to the conventional copper tip and nozzle, it was clearly due to wear. Deformation was observed, which interfered with stable wire and power supply, and caused problems such as spark melting between the tip and the wire.

In addition, do not apply spatter adhesion prevention agent to the tip or nozzle.
When welding was carried out under the same welding conditions of 28V and 270A as in Example 3, not only did spatter adhere to the nozzle and tip in an uneven amount in about 10 minutes, making it impossible to weld, but some of the spatter was also welded to the tip and nozzle. caused damage.

Example (4) Birophosphoric acid in which ZrO2 having a particle size ranging from 0 to 4μ was uniformly dispersed by the same method as in Example (1).

D K 2.5 A/dm2 from a copper bath. Bath temperature 60℃
The sample was electrolytically treated for 45 minutes under the conditions of 20 μar O2 dispersed copper plating film on the inner and outer surfaces of the tip and nozzle, and the chip after consuming 55 Kf of 1.2φ wire under the welding conditions of voltage 25 V + current 250 A. When the through-hole was observed, no deformation due to wear was observed, but spatter adhered to the tip and nozzle, necessitating a periodic spatter removal process. As a result of analysis, the ZrO2 content in the ZrOx dispersed steel plating film was 22vo IN.

Table 1 summarizes the above examples, and as is clear from these examples, tips and nozzles made of this composite material have the required electrical conductivity, wear resistance, It has been found that it exhibits sufficient performance in terms of sludge resistance, improves welding quality, reduces troubles, and greatly contributes to labor savings in welding work.

Claims (2)

[Claims] (1) Copper/copper alloy matrix metal with hexagonal boron nitride, molybdenum sulfide, tungsten sulfide, graphite, graphite fluoride as a lubricant, silicon nitride, aluminum nitride, cubic boron nitride, titanium nitride, titanium carbide. , chromium carbide, diamond, silicon carbide, alumina, zirconia, tungsten carbide as anti-wear agents, one or more components of lubricants, or one or more components of both lubricants and anti-wear agents. A coating made of a composite material in which copper and copper alloy are uniformly dispersed and coated on the inner and outer surfaces of arc welding tips and nozzles made of copper and copper alloy. (2) A lubricant and an anti-wear agent consisting of the same components as in (1) are added to the copper/copper alloy matrix metal as a dispersant, and at least one component of the lubricant or both the lubricant and the anti-wear agent are added to the copper/copper alloy matrix metal. Arc welding tips and nozzles made by sintering and molding a composite material selected from one or more components.