Oliff PLC
Resistance spot welding method
Resistance spot welding is performed on a combination of overlapping steel sheets including at least one steel sheet that has, on a surface thereof, a coated layer with zinc as a main component, by (1) starting electric current passage in a state satisfying 0.9×t≦L≦1.1×t; and (2) dividing electric current into main current and initial current that precedes the main current and is two-step current, setting a current value I1 during current in a first step of the initial current to satisfy Im×1.1≦I1≦15.0 kA with respect to a current value Im during the main current, and setting a current value I2 in the subsequent second step to no current or low current satisfying 0≦I2≦Im×0.7.
JFE STEEL CORPORATION
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Rinsei Yasuaki Koichi
Ikeda Okita Taniguchi