| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a spot welding method of a pair of thin steel plates capable of achieving excellent tensile strength in a spot welding part without impeding productivity and preventing thermal deformation caused by spot welding. <P>SOLUTION: The spot welding method adopted includes a first step for forming an emboss bulging forming part 11a by carrying out emboss bulging forming to one thin steel plate 11 of the pair of the steel plates, a second step for forming a compressed mark part 11b having an annular protrusion 11c by squeezing the emboss bulging forming part 11a, and a third step for spot-welding the pair of the thin steel plates 11, 12 by superposing the other steel plate 12 on a side where the protrusion 11c of one steel plate 11 protrudes. <P>COPYRIGHT: (C)2012,JPO&INPIT |
