A kind of welding method of copper tungsten electrode

A welding method, copper and tungsten technology, applied in welding equipment, welding/welding/cutting articles, manufacturing tools, etc., can solve the problem of low welding brazing rate, and achieve the effect of improving welding brazing rate and qualified welding strength

Active Publication Date: 2019-12-13
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the soldering rate of copper tungsten electrodes with a diameter of 35mm is less than 60%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Ⅰ. Preparation before welding

[0027] The copper-tungsten disc with a diameter of Ф35mm and a thickness of 8mm is a copper-tungsten head, and a pure copper rod with a diameter of Ф36mm and a length of 40mm is a copper seat. The welding surface of the copper-tungsten head is a circular plane of Ф35mm. Ф36mm circular plane; clean and remove oxides, oil stains and other impurities on the surface to be welded;

[0028] Ⅱ. Assembly of parts to be welded

[0029] Step Ⅰ The cleaned copper tungsten head and the copper base are each evenly coated with a layer of copper or copper alloy brazing flux. In this example, a paste-like silver brazing flux is used. The two sides to be welded are connected and clamped on the electrode On the special welding fixture, the surface to be welded is horizontal;

[0030] Ⅲ. Apply flow blocking agent

[0031] Apply flow blocking agent to the outer circle weld of the surface to be welded where the copper tungsten head and the copper seat butt, and separ...

Embodiment 2

[0037] Step I pre-welding preparation is assembling the weldment to be welded in Step II, which is the same as in Example 1;

[0038] Ⅲ. Apply flow blocking agent

[0039] Similar to Example 1; in this example, the length of the solder adding zone is 30% of the circumference of the external weld, and the length of the exhaust zone is 40% of the circumference of the external weld. The connection between the centers of the two zones passes through the surface to be welded. The center of the circle; the length of the two welds where the flow blocking agent is applied is 15% of the circumference of the outer circle weld

[0040] The flow blocking agent in this example is a mixture of zirconium oxide and polyethylene glycol adhesive, and the weight ratio of oxide to adhesive is 10:3.

[0041] Ⅳ, brazing

[0042] Put the parts to be welded after processing in step III into the induction coil of the high-frequency induction heating equipment together with the fixture. The solder of this exam...

Embodiment 3

[0045] Step I pre-welding preparation is assembling the weldment to be welded in Step II, which is the same as in Example 1;

[0046] Ⅲ. Apply flow blocking agent

[0047] Similar to Example 1; in this example, the length of the solder adding zone is 15% of the circumference of the external weld, and the length of the exhaust zone is 25% of the circumference of the external weld. The connection between the centers of the two zones passes through the surface to be welded. The center of the circle; the length of the two welds where the flow blocking agent is applied is 30% of the circumference of the outer circle weld

[0048] The flow blocking agent in this example is a mixture of titanium oxide and acrylic polymer adhesive, and the weight ratio of oxide to adhesive is 10:2.

[0049] Ⅳ, brazing

[0050] Put the parts to be welded after processing in step III into the induction coil of the high-frequency induction heating equipment together with the fixture. The solder of this example i...

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Abstract

The invention relates to a welding method of a copper-tungsten electrode. A copper-tungsten head made from a copper-tungsten material and a cupper base prepared from pure copper or a copper alloy arewelded to the copper-tungsten electrode. The welding method comprises the following steps: cleaning a to-be-welded surface; carrying out butt joint and clamping the to-be-welded surface coated with abrazing mixture, wherein the to-be-welded surface is horizontal; smearing a stop-off agent to a peripheral weld joint of the to-be-welded surface to partition the weld joint to an exhaust area which accounts for 25-40% and a solder adding area which accounts for 15-30%, wherein the weld joint positions of the solder adding area and the exhaust area are opposite; and packaging a to-be-welded pieceand a clamp in high frequency induction heating equipment, placing a proper amount of solder in the solder adding area, quickly heating the solder till the solder is melted, adjusting the induction current to insulate, shutting down the heating equipment till all the exhaust area has the melted solder, and carrying out cooling to obtain the copper-tungsten electrode. According to the method, the stop-off agent inhibits flowing of the melted solder at the peripheral weld joint, the melted solder flows in from the solder adding area and flows out from the exhaust area to extrude gas in gaps, sothat the problem of exhausting of gas in gaps when a large specification copper-tungsten electrode is brazed is solved. The brazed rate is improved obviously, reaching 80% or above.

Description

Technical field [0001] The invention belongs to the technical field of welding, and specifically relates to a welding method of a copper-tungsten electrode. Background technique [0002] Copper-tungsten materials have good arc erosion resistance and electrical and thermal conductivity, and are widely used in electrical switches and electrodes. Copper and tungsten materials are usually prepared by powder metallurgy, which is complicated and costly, but as long as they have a certain thickness, they can meet the requirements of high temperature resistance, wear resistance and arc corrosion resistance during use. [0003] The cost of copper or copper alloy is lower than that of copper-tungsten materials, and it has good electrical and thermal conductivity, which can ensure the current conduction, heat transfer and heat dissipation of the electrode. [0004] Therefore, when preparing the electrode, the copper-tungsten material is made into a sheet or block-shaped copper-tungsten head, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/002B23K1/20B23K1/19B23K101/36
CPCB23K1/002B23K1/19B23K1/206
Inventor 颜培涛陈名勇吴春涛贾波
Owner 桂林金格电工电子材料科技有限公司
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