Method for making integral electric contact

An electric contact and integrated technology, applied in the direction of manufacturing tools, circuits, electric switches, etc., can solve the problems of long processing cycle, falling off after welding, easy to generate heat, etc., achieve short welding cycle, save copper materials, and improve production efficiency Effect

Inactive Publication Date: 2005-02-09
BEIJING SHANGHUAYANG ELECTRONICS TECH DEV
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Commonly used silver alloy or copper alloy brazing method, the interface conductivity and bonding strength are smaller than the base metal, after welding, the copper tail end is annealed and softened, the interface performance becomes the weak link of the electrical contact, it is easy to heat up during use, and it is easy to open the welding The other method is the liquid phase sintered electrical contact, the interface strength can be close to the base metal strength (copper tail), and the electrical performance reaches the level of copper-tungsten alloy, but the processing cycle is long and the material is expensive

Method used

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Embodiment Construction

[0012] The purpose of the present invention is to provide a method for manufacturing an integral electrical contact, which is characterized in that: the present invention uses friction welding to closely contact two different metal planes, and depends on the diffusion of atoms between the metals under a certain pressure and speed. And connect. The process is:

[0013] 1). Copper-tungsten alloy sintering: the pre-pressed alloy billet is fired for 1.5 hours under the protection of hydrogen at a temperature of 1360°C, and the temperature is naturally reduced.

[0014] 2). Preparation before welding: the joint is designed for large-plane contact, the outer circle of the weldment is cylindrical, and its flatness and verticality are not more than 0.2mm. Before welding, the surface of the joint is polished with a file or sandpaper to remove oxides, and the surface is treated with alcohol Or clean with ether to prevent incorporation of other ions or impurities;

[0015] 3). Friction weldi...

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Abstract

The invention discloses the method for manufacturing the solid type electric contact belonging to the sintering technique. The technique of the friction welding makes the two kinds of metals composed of the electric contact weld together. Then the proper heart treatment for removing the internal stress and the whole form processing are carried out so as to obtain the solid type electric contact with better tensils strength and rigidity. Comparing with the liquid phase sintering, the friction welding technique provides the advantages of 5% higher yield, productivity raised 7.3 times, saving copper product more than 36%, eliminating the procedure for treating the solidified liquid.

Description

Technical field [0001] The invention belongs to the scope of welding technology, and particularly relates to a method for manufacturing integral electric contacts which is widely used in various medium and high voltage circuit breakers. Background technique [0002] Integral electrical contacts are widely used in various medium and high voltage circuit breakers and are the core components of various power switches. At present, the overall liquid phase sintering process is generally used to manufacture integral electrical contacts. The integral contact is a special part composed of two different materials. Its head is a copper-tungsten alloy for arc extinguishing, and its tail is generally a copper alloy of QCr0.5. Its main function is to have a certain Elasticity and good electrical conductivity. As far as the integral electric contact is concerned, the bonding strength and electrical conductivity of the bonding surface of the two materials are the most critical factors affecting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12H01H11/04
Inventor 段沛林孙芸
Owner BEIJING SHANGHUAYANG ELECTRONICS TECH DEV
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