| 摘要 |
When resistance spot welding a set of plates obtained by overlapping a plurality of steel plates comprising one or more steel plates having, on the surface thereof, a plating layer having zinc as the principal component thereof, a nugget having sufficient diameter is stably formed without any splashing, by: (1) starting conduction while in a state in which t and L satisfy the relational expression 0.9×t≤L≤1.1×t, given that the total thickness of the overlapping steel plates is t, and the distance of the center interval between top and bottom electrodes is L; and (2) dividing the conduction into a main conduction and an initial conduction preceding the main conduction, and with the initial conduction treated as two stages of conduction, setting the current value (I1) in the first conduction stage of the initial conduction so as to fall into a range satisfying, in a relationship with the current value (Im) of the main conduction, Im×1.1≤I1≤15.0kA, and setting the current value (I2) in the subsequent second conduction stage to be off or to be low-current conduction so as to satisfy 0≤I2≤Im×0.7. |
