| 摘要 |
PROBLEM TO BE SOLVED: To provide a resistance spot welding method that is advantageous in obtaining a sound weld zone between a thin plate and a thick plate, even with presence of any gap between the plates, in a plate assembly having a large thickness ratio in which a thin plate is superposed on at least any one of two or more superposed thick plates. SOLUTION: In performing the resistance spot welding while holding a plate assembly (workpiece) 10 by a pair of electrodes 16, 17 and applying the pressure thereto, the workpiece 10 having a large thickness ratio such that a thin steel plate 11 is superposed on superposed two thick plates 12, 13 and that gaps 31, 32 are also present between the steel plates, there are provided a preliminary process and a regular process. In the preliminary process, the workpiece is pressurized with a high pressure to collapse the gaps 31, 32 and then the pressure is reduced. In the regular process, welding is performed under low pressure, short time and high current in the early stage of the welding, and then welding is performed under high pressure in the latter stage. COPYRIGHT: (C)2010,JPO&INPIT
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