| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resistance spot welded joint of a high-strength thin steel sheet excellent in joint tensile characteristics, and a welding technique to obtain the joint. <P>SOLUTION: A resistance spot welding method for welding a sheet bundle of two or more steel sheets which are piled up by sandwiching with a pair of welding electrodes, pressurizing, and energizing includes a main process for forming a nugget of a prescribed diameter by energization, a middle process for pressurizing the nugget while non-energizing, and a post-process for re-energizing the nugget. In the post-process, the maximum temperature TT of the interface between the nugget and a corona bond on a non-melting part side satisfies TT>Ac<SB POS="POST">3</SB>. <P>COPYRIGHT: (C)2013,JPO&INPIT |
