| 摘要 |
PROBLEM TO BE SOLVED: To conduct spot welding to an aluminum alloy member without a defect. SOLUTION: An aluminum alloy plate 1 of a thickness of (t)mm and an aluminum alloy plate 2 of a thickness of (t)mm or more are superposed and loaded on a single phase DC welding machine. Under this state, both members 1, 2 are held between a pair of electrodes while applied with a prescribed pressure. Under this state, a primary electric current of a prescribed electric current (I) is energized for a prescribed time ((n) cycle). And then the electric current having 0.91-0.77 (I) is energized for a time of 0.7(t)×(n) to 2(t)×(n) secondary energizing). Accordingly, by conducting spot welding under this condition, a defect due to thermal stress is not caused around a welding nugget. |
