METHOD FOR MANUFACTURING JOINED BODY, RESISTANCE SPOT WELDING APPARATUS, AND COMPOSITE ELECTRODE USED FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a joined body capable of stably forming a nugget even when spot welding is performed to a plate set including three or more metal plates.SOLUTION: In a method for manufacturing a joined body according to a present embodiment, a convergence electrode (30) having a convex shape tip surface is brought into contact with a surface of a thin plate (2) of a plate set (1) including the thin plate (2) and a plurality of thick plates (3), and a dispersed electrode (40) having a tip surface (400) on which an energization region (410) is disposed around a central axis (CL40) is brought into contact with a surface of a thick plate (3B), to perform resistance spot welding. Subsequently, instead of the dispersed electrode (40), a new convergence electrode is brought into contact with the surface of the thick plate (3B) to perform the resistance spot welding.