| 摘要 |
PROBLEM TO BE SOLVED: To provide a resistant spot welding method for an aluminum-based material and a steel material, capable of assuring jointing strength while improving productivity.SOLUTION: When a resistant spot welding is performed by electrifying electrodes 30a and 30b while sandwiching a steel material 20 and an aluminum base material 10 in such a state that they are stacked together with the pair of electrodes 30a and 30b, the electrodes 30a and 30b are supplied with a current in such a way as an integrated current amount of the electrodes 30a and 30b accumulated during a preset reference period increases stepwise, intermittently through a plurality of steps. In each step, after a current value is gradually increased from the start of electrification until reaching a given welding current value, a current is supplied to the electrode during a predetermined time period while the welding current value is kept. Otherwise/further, after the current is supplied to the electrode during the predetermined time period while the given welding current value is kept, the current value is gradually decreased and electrification is stopped. |
