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

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 ...

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.