| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to stably form a nugget having an effective size even if there is a plate space right below a welding electrode.SOLUTION: A one-side spot welding method includes: a heating step (S1) for so heating one metal plate 1 by electric conduction that an electric resistance of said one metal plate 1 of overlapped two metal plates 1, 2 on a circumference of a contact part 1a between itself and a welding electrode 3 becomes larger than an electric resistance when an electric current flows from said one metal plate 1 to the other metal plate 2 right below the contact part 1a; and a nugget formation step (S2) of forming a nugget 5 which is formed over the other metal plate 2 right below the contact 1a by electrically conducting with an electric current which is larger compared with that in the heating step (S1).SELECTED DRAWING: Figure 3 |
