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A kind of welding method of silver-molybdenum electrode

A welding method and molybdenum electrode technology are applied in the welding field of silver molybdenum electrodes, which 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: 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 silver-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 silver-molybdenum disc with a diameter of Ф30mm and a thickness of 6mm is a silver-molybdenum head, and a pure copper rod with a diameter of Ф33mm and a length of 30mm is a copper seat. Ф33mm 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 silver-molybdenum head and the copper seat to be welded after cleaning in step 1. In this example, paste silver brazing flux is used. 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 silver-molybdenum head and copper seat are butted, and divide the entire outer circular weld seam i...

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 relates to a welding method of a silver-molybdenum electrode. A silver-molybdenum head made from a silver-molybdenum material and a cupper base prepared from pure copper or a copper alloy are welded to the silver-molybdenum 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 coatedwith a brazing 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 areawhich 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 piece and 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 silver-molybdenum 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 ingaps, so that the problem of exhausting of gas in gaps when a large specification silver-molybdenum 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 in particular relates to a welding method for silver-molybdenum electrodes. Background technique [0002] Silver molybdenum material has good arc corrosion resistance and electrical and thermal conductivity, and is widely used in electrical switches and electrodes. Silver-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 silver-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 silver-molybdenum material is made into a sheet or block-shaped silver-m...

Claims

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Application Information

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