Study on Influence of Electrode Type on Weld ability of TL091 Al. Alloy in Medium Frequency RSW

Abstract

The characteristics and difficulties of medium frequency resistance RSW (MFRSW) of high strength Al alloy TL091 were analyzed. In order to improve the service life of Al. alloy RSW electrode cap (EC), the shape of EC and welding parameters were studied. The weld ability of RSW of Al. alloy TL091 was studied by using a special pressing mold to make the surface of EC form a special shape. By studying the type and size of the surface-forming mold, pressing method and pressing parameters, the key factors affecting the weld ability of Al. alloy RSW were obtained. The specification and shape of compaction mold will affect the adhesion between alloy and EC, and pit depth, pit distance width and boss size of the mold have great influence on welding ability of Al RSW after single grinding. When indentation depth of the pressing mold is 0.5 mm, the width between the molds is 0.4~0.5 mm, and the width of bulge is 0.2 mm, it can obtain a RSW capability of at least 128 points after each grinding. The direction and ideas for improving the life of Al. alloy RSW EC were determined, which could provide reference for the optimization of automobile Al. alloy RSW.