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A Method for Improving the Quality Consistency of Electric Contact Welding

A technology of welding quality and electrical contacts, applied in welding equipment, metal processing equipment, manufacturing tools, etc., to achieve the effect of different conditions, simple operation, and significant economic benefits

Active Publication Date: 2019-01-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies and defects existing in the prior art and provide a method for improving the consistency of electrical contact welding quality

Method used

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  • A Method for Improving the Quality Consistency of Electric Contact Welding
  • A Method for Improving the Quality Consistency of Electric Contact Welding
  • A Method for Improving the Quality Consistency of Electric Contact Welding

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Experimental program
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Effect test

Embodiment 1

[0034] Adopt the method of the present invention to improve the post-treatment process after a certain type of silver contact is welded, and the method includes the following steps:

[0035] In the first step, during the entire post-processing process of silver contacts, the silver contacts are pretreated before heat treatment.

[0036] The pretreatment refers to the removal of impurities and surface oxide layers on the surface of the silver contacts by pickling.

[0037] The pickling refers to mixing sulfuric acid and water in a mass ratio of 1:10, and then cleaning the surface of the electric contact with the prepared reagent.

[0038] In the second step, heat treatment is performed on the pretreated silver contacts.

[0039] The heat treatment temperature is 80° C., the time is 30 minutes, and the environment is vacuum. The purpose of the heat treatment is mainly to remove the organic matter remaining in the first step.

[0040] In the third step, the heat-treated silver ...

Embodiment 2

[0048] Adopt method of the present invention to improve the post-treatment process after a certain type of silver-graphite contact welding, described method comprises the following steps:

[0049] In the first step, in the entire post-processing process of the silver-graphite contact, the silver-graphite contact is pretreated before heat treatment.

[0050] The pretreatment refers to the removal of impurities and surface oxide layers on the surface of the silver-graphite contacts by pickling.

[0051] The pickling refers to mixing nitric acid and water in a mass ratio of 1:10, and then cleaning the surface of the electrical contact with the prepared reagent.

[0052] The second step is to heat-treat the pre-treated silver-graphite contacts.

[0053] The heat treatment temperature is 120° C., time is 25 minutes, and the environment is vacuum, the purpose of which is mainly to remove the residual organic matter in the first step.

[0054] In the third step, the heat-treated si...

Embodiment 3

[0062] Using the method of the present invention to improve the post-treatment process after a certain type of silver-tungsten contact is welded, the method includes the following steps:

[0063] In the first step, during the entire post-processing process of silver-tungsten contacts, the silver-tungsten contacts are pretreated before heat treatment.

[0064] The pretreatment refers to the removal of impurities and surface oxide layers on the surface of the silver-tungsten contacts by pickling.

[0065] The pickling refers to mixing hydrogen peroxide and water in a mass ratio of 1:10, and then cleaning the surface of the electric contact with the prepared reagent.

[0066] The second step is to heat-treat the pre-treated silver-tungsten contacts.

[0067] The heat treatment temperature is 150° C. for 20 minutes, the environment is vacuum, and its purpose is mainly to remove the organic matter remaining in the first step.

[0068] The third step is to perform ball milling and...

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Abstract

The invention relates to the technical field of welding and aims at providing a method for improving electric contact welding quality consistency. The method comprises the following steps: carrying out acid pickling for removing surface impurities and surface oxide layers, carrying out heat treatment for removing residual organic matters; carrying out ball grinding and polishing on electric contacts subjected to heat treatment, then cleaning with purified water, and drying; carrying out deburring treatment on the edge of a welding surface of each electric contact; placing the treated electric contacts onto welding equipment, and carrying out welding operation, to obtain an electric contact component finished product. Compared with the prior art, the method provided by the invention has the advantages that the deburring treatment on the edge of the welding surface is added, and the condition that the welding surface is rugged with concave and convex parts is reduced, so that shear strength of the welded electric contacts is generally improved, proportion of components with high shear strength after being welded is obviously increased, and welding quality consistency of the electric contact components in different batches is obviously improved; meanwhile, the operation is simple, and different condition demands can be better met, so that the method has obvious economic benefit.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a new method for improving the consistency of welding quality of electric contacts. Background technique [0002] Induction brazing is a method that uses the Joule effect of the eddy current formed in the workpiece by the alternating magnetic field generated by the inductor to heat the workpiece to melt the solder to achieve brazing. [0003] The quality of the welding effect has a very important direct relationship with the on-off ability of the electric contact, arc burnout and service life, and the reliability of the electrical operation. Without reliable welding quality, no matter how good the contact material is, it will not be able to play its role. out of its excellent performance. However, in the actual production process, due to the influence of factors such as welding process parameters, silver spot welding surface roughness, and paste volume, it brings ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/002B23K1/20B24C1/08
CPCB23K1/002B23K1/206B24C1/08
Inventor 王蕾张玲洁樊先平陈晓祁更新杨辉
Owner ZHEJIANG UNIV
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