Zhang Ze: Nanche Sifang Vehicle Co., Ltd., Engineer, Qingdao, Shandong Province, 266031

Zhang Qiang: Nanche Sifang Vehicle Co., Ltd., Assistant Engineer, Qingdao, Shandong Province, 266031 (attached documents)

ABSTRACT: The chemical composition and mechanical properties of 5A05 aluminium alloy welding base metal and resistance spot welding equipment are introduced. The resistance spot welding characteristics and joint forms, & ldquo; hard specification & rdquo; & ldquo; soft specification & rdquo; and secondary spot welding process parameters are analyzed, and the appearance inspection, tensile test and tear test of welded joints are carried out. The results of shear test and macro metallographic test show that the macro metallographic nugget formation of the second spot welding process of resistance welding is good, and there are no defects such as cracks, shrinkage, shrinkage and core offset, which can improve the resistance welding performance of 5A05 aluminium alloy to a certain extent.

Key words: 5A05 aluminium alloy; resistance spot welding; secondary spot welding; process research; high-speed train