| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a resistance spot welding method capable of increasing the strength of weld joints between a thin plate and a thick plate and between thick plates irrespective of presence/absence of any gap between any steel plates of a plate assembly when performing the resistance spot welding of the plate assembly having the large thickness ratio in which a thin plate is superposed on at least any one of two or more superposed thick plates. <P>SOLUTION: When performing the resistance spot welding while holding a workpiece of a plate assembly in which a thin plate 11 is superposed on superposed two thick plates 12, 13 by a pair of electrodes 21, 22 and applying the pressure thereto, the workpiece 10 is fixed, the electrode 21 on the side in contact with the thin plate 11 forms a fixed electrode of a welding gun, an electrode 22 on the side in contact with the thick plate 13 forms a movable electrode, and the welding is performed in two-staged processes. The welding is performed with low pressure and high current in the first process, and the welding is performed with the pressure higher than that in the first process. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
