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Method for cryogenic treatment of galvanized steel sheet resistance spot welding electrode

A technology of cryogenic treatment and resistance spot welding, applied in the direction of electrode characteristics, welding medium, welding equipment, etc., to achieve the effects of being conducive to environmental protection, improving working life and low development cost

Inactive Publication Date: 2003-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, it has not been reported that the cryogenic electrode, that is, the electrode that has been processed by cryogenic treatment and has undergone changes in structure and performance, is used for resistance spot welding of galvanized steel sheets and significantly improves the electrode life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0021] 1. Take 3 pairs / group of cryogenically treated electrodes and 3 pairs / group of electrodes that have not been cryogenically treated;

[0022] 2. The electrode materials are Cu-Cr and Cu-Cr-Zr respectively;

[0023] 3. Spot-welded galvanized steel sheet: The spot-welded galvanized steel sheet is a hot-dip galvanized steel sheet. The spot welding performance of this steel sheet is poorer among various galvanized steel sheets, and the splash is also larger, so the use of this steel sheet is more targeted , plate thickness δ=0.8mm;

[0024] 4. Process parameters of spot welding: spot welding current 10050A, welding time 0.1s, electrode pressure 2500N, water flow 3 liters / minute;

[0025] 5. See Table 2 for the comparison results of the working life of the spot welding cryogenic electrode of the present invention and the spot welding electrode of the prior art.

[0026]

Electrode type

Working life (number of solder joints)

Electrodes not cryoge...

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PUM

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Abstract

A process for deep cold treatment of the spot-welding electrode for the galvanized steel plate in order to elongate its service life includes putting the Cu-alloy electrodes in a container full of deep cold medium in a deep cold treater layer by layer, setting parameters, deep cold treating, and naturally raising their temp to ordinary temp. Its advantages are long service life elongated by 4 times, no splash on welding, and high welding quality.

Description

technical field [0001] This invention relates to methods of altering the physical structure of non-ferrous alloys. Background technique [0002] The loss caused by automobile corrosion far exceeds that of other industries, and the anti-corrosion problem in the automobile industry is quite urgent. The research report of Bell Laboratories pointed out that the annual loss caused by corrosion in the United States is 300 billion U.S. dollars, and nearly 40% of the metal corrosion loss is generated in the production, use and maintenance of automobiles, while none of the other industries exceeds 4%, and most of them are less than 1 %. Therefore, the anti-corrosion problem of automobiles is very important. [0003] Galvanized steel sheets have higher corrosion resistance than ordinary bare steel sheets. In order to improve the corrosion resistance of the automobile body and some parts and prolong the service life of the automobile, more and more galvanized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/30B23K35/04C22F1/08
Inventor 廉金瑞吴志生单平胡绳荪刘翠荣
Owner TIANJIN UNIV
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