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

A technology for repairing electrical contact materials and defects, applied to circuits, electrical switches, electrical components, etc., can solve problems such as irreparable, increased cost, waste, etc., and achieve the effects of enhancing competitiveness, improving efficiency, and high yield

Inactive Publication Date: 2010-01-27
NANTONG YONGDA PIPE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for repairing defects of tungsten-copper-copper integral electrical contact materials, so as to overcome the defects in the prior art that the defects on the tungsten-copper-copper integral electrical contact materials cannot be repaired, causing waste and increasing costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] To repair the cracks on the surface of the copper tail part of the tungsten copper-copper integral electrical contact material with a width of 0.5 mm, a depth of 2 mm, and a length of 20 mm, including the following steps:

[0017] Step 1, clean up the inclusions in the defect:

[0018] Put the tungsten-copper-copper integral electrical contact part to be repaired on the laser welding machine table, use the laser to melt the surface of the defective part quickly, and then clean up the inclusions in the defective part;

[0019] Step 2, add filling material to the defect:

[0020] The defective part of this embodiment is located at the copper tail, and the volume of the defective part is 20 cubic millimeters; a certain amount of copper powder is weighed first, and the quality of the copper powder is 1.2 times of the product value of the defective part volume and the copper tail density, after calculation, determine The copper powder to be weighed is 0.2 grams. Then unifo...

Embodiment 2

[0027] The shrinkage cavity at the copper tail end of the tungsten copper-copper integral electrical contact material is repaired with a diameter of 2 mm and a depth of 10 mm, including the following steps:

[0028] Step 1, clean up the inclusions in the defect:

[0029] Put the tungsten-copper-copper integral electrical contact part to be repaired on the laser welding machine table, use the laser to melt the surface of the defective part quickly, and then clean up the inclusions in the defective part;

[0030] Step 2, add filling material to the defect:

[0031] The defective part of this embodiment is located at the copper tail, and the volume of the defective part is 31.4 cubic millimeters; a certain amount of copper powder is weighed first, and the quality of the copper powder is 1.2 times of the product value of the defect part volume and the copper tail density, after calculation, determine The copper powder to be weighed is 0.34 grams. Then uniformly mix 0.34 gram of ...

Embodiment 3

[0038] Repair microcracks at the joint surface of tungsten copper-copper integral electrical contact material tungsten copper and copper with a width of 0.2 mm, a depth of 2 mm, and a length of 15 mm, including the following steps:

[0039] Step 1, clean up the inclusions in the defect:

[0040] Put the tungsten-copper-copper integral electrical contact part to be repaired on the laser welding machine table, use the laser to melt the surface of the defective part quickly, and then clean up the inclusions in the defective part;

[0041] Step 2, add filling material to the defect:

[0042] The defective part of this embodiment is located at the junction of tungsten-copper and copper in the electrical contact, and copper powder is usually added. The volume of the defective part is 6 cubic millimeters; a certain amount of copper powder is first weighed, and the quality of the copper powder is the volume of the defective part 1.2 times of the copper tail density product value, aft...

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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...

Claims

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Application Information

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IPC IPC(8): H01H11/04B22F3/105
Inventor 陈文革张忠义
Owner NANTONG YONGDA PIPE IND
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