Copper-molybdenum electrode welding method

A welding method, copper-molybdenum technology, which is applied in the field of copper-molybdenum electrode welding, can solve the problems of low welding brazing rate, etc., and achieve the effect of improving welding brazing rate and qualified welding strength

Active Publication Date: 2018-07-03
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-molybdenum 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-molybdenum disc with a diameter of Ф35mm and a thickness of 8mm is a copper-molybdenum head. The pure copper rod with a diameter of Ф36mm and a length of 40mm is a copper seat. The surface to be welded of the copper-molybdenum head is a circular plane of Ф35mm. Ф36mm circular plane; clean and remove oxides, oil and other impurities on the surface to be welded;

[0028] Ⅱ. Assembly of parts to be welded

[0029] Apply a layer of copper or copper alloy brazing flux evenly on the copper-molybdenum head and the copper seat to be welded after cleaning in step 1. In this example, paste silver brazing flux is selected. The two to-be-welded surfaces are connected and clamped on the electrode On the special welding fixture, the surface to be welded is in a horizontal state;

[0030] Ⅲ. Apply flow blocking agent

[0031] Apply flow blocking agent on the outer circular weld seam of the surface to be welded where the copper-molyb...

Embodiment 2

[0037] Step Ⅰ preparation before welding and step Ⅱ to be welded parts assembly, the same as embodiment 1;

[0038] Ⅲ. Apply flow blocking agent

[0039] Similar to Example 1; in this example, the length of the brazing filler metal addition zone is 30% of the perimeter of the outer circular weld, the length of the exhaust zone is 40% of the perimeter of the outer weld, and the line connecting 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 choke is applied is 15% of the circumference of the outer weld

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

[0041] Ⅳ. Brazing

[0042] Put the workpiece to be welded after the processing of step III together with the fixture into the induction coil of the high-frequency induction heating equipment. This example solder is identical with embodimen...

Embodiment 3

[0045] Step Ⅰ preparation before welding and step Ⅱ to be welded parts assembly, the same as embodiment 1;

[0046] Ⅲ. Apply flow blocking agent

[0047] Similar to Example 1; in this example, the length of the filler metal addition zone is 15% of the perimeter of the outer circular weld, the length of the exhaust zone is 25% of the perimeter of the outer weld, and the line connecting 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 choke is applied is 30% of the circumference of the outer weld

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

[0049] Ⅳ. Brazing

[0050] Put the workpiece to be welded after the processing of step III together with the fixture into the induction coil of the high-frequency induction heating equipment. This example solder is identical with embodiment 1. ...

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Abstract

The invention discloses a copper-molybdenum electrode welding method. An copper-molybdenum electrode is formed through welding of a copper-molybdenum head and a copper seat, wherein the copper-molybdenum head is made of copper-molybdenum material; and the copper seat is made of pure copper or copper alloy. The copper-molybdenum electrode welding method comprises the following steps: cleaning a to-be-welded surface; smearing brazing flux on the to-be-welded surface, and then carrying out butt joint and clamping to enable the to-be-welded surface to be horizontal; smearing a stop-off agent in the welding line on the periphery of the to-be-welded surface to separate the welding line into an air exhausting area accounting for 25%-40% and a brazing filler metal adding area accounting for 15%-30%; enabling the welding line positions of the brazing filler metal adding area and the air exhausting area to be opposite; mounting a to-be-welded piece and a clamp into high-frequency induction heating equipment; placing a proper amount of brazing filler metal in the brazing filler metal adding area; quickly heating to fuse the brazing filler metal; adjusting induced current for heat preservation; shutting down the heating equipment until fused brazing filler metal on the entire air exhausting area; and cooling to obtain the copper-molybdenum electrode. According to the copper-molybdenum electrode welding method, the stop-off agent restrains fused brazing filler metal to flow in the welding line on the periphery; the fused brazing filler metal flows in the brazing filler metal adding areaand flows out of the air exhausting area to squeeze the air in the gap out, so that the problem about discharging of the air in the gap when a large-specification copper-molybdenum electrode is brazed is solved; and the brazing rate is remarkably increased to be 80% or above.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a welding method for copper-molybdenum electrodes. Background technique [0002] Copper-molybdenum material has good arc corrosion resistance and electrical and thermal conductivity, and is widely used in electrical switches and electrodes. Copper-molybdenum materials are usually prepared by powder metallurgy process, which is complex and costly, but as long as it has a certain thickness, it 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-molybdenum materials, and it has good electrical and thermal conductivity, which can ensure the current conduction, heat transfer and heat dissipation of the electrodes. [0004] Therefore, when preparing the electrode, the copper-molybdenum material is made into a sheet or block-shaped copper-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/19B23K1/20
CPCB23K1/0008B23K1/19B23K1/20B23K1/206
Inventor 颜培涛叶凡陈名勇吴春涛林毓
Owner 桂林金格电工电子材料科技有限公司
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