Method for repairing defect in tungsten copper-copper integral electric contact material

Abstract

The invention provides a method for repairing a defect in a tungsten copper-copper integral electric contact material. The method comprises the following steps: firstly, eliminating impurities in the part of the defect; secondly, weighting metal powders containing the materials identical to that of the electric contact in the part of the defect, wherein the mass of the metal powders is 1.2 times the product of the volume of part of the defect and the density of the electric contact material in the part of the defect; thirdly, uniformly mixing the weighed metal powders with a glycerin solution to produce a filling material, and then coating the filling material in the part of the defect in the electric contact part; after the part of the defect is filled up with the filling material, in the circumstance of taking nitrogen as a protective atmosphere, scanning and remelting the filling material in the part of the defect with a high-energy laser beam; in the remelting process, complementing the filling material in the part of the defect blown away due to spraying nitrogen is replaced at the same time, and melting the refilled filling material with a parent material until the part of the defect is full and slightly convex; and finally, grinding and polishing the repaired electric contact part. The method is easy to operate, the product rate is high and the repaired product has stable performance and high quality.

Description

technical field

[0001] The invention belongs to the technical field of electrical materials, and in particular relates to a method for repairing defects of tungsten copper-copper integral electrical contact materials Background technique

[0002] Integral electrical contacts are used in various medium and high voltage circuit breakers and are the core components of various power switches. The integral contact is a part composed of two different materials. The head is made of tungsten-copper alloy, which is used for arc extinguishing; the tail is made of copper or copper alloy, and its function is to have certain elasticity and good electrical conductivity. Tungsten-copper alloy is widely used as electrode material, electronic packaging and electrical contact material because of its good electrical conductivity, thermal conductivity and arc corrosion resistance. When it is used, it is often required to be integrated with copper or copper alloy with better electrical conductiv...