| 摘要 |
PROBLEM TO BE SOLVED: To provide a spot welding method and spot welding device which provide uniform and stable welding quality in a simple manner, in spot-welding three superimposed members to be welded.SOLUTION: When spot-welding a members 50 to be welded in which a thin plate 51, a first thick plate 52 and a second thick plate 53 are superimposed, the member 50 to be welded are held and pressurized with a lower welding electrode 22 in contact with the second thick plate 53 and an upper welding electrode 25 in contact with the thin plate 51, wherein the electrodes are arranged opposite to each other. In this pressurized state, the thin plate 51 and the first thick plate 52 are spot-welded by energizing between the upper welding electrode 25 and a grounding function electrode 28 in contact with the thin plate 51. In a non-energized state between the upper welding electrode 25 and the grounding function electrode 28, the first thick plate 52 and the second thick plate 53 are spot-welded by energizing between the upper welding electrode 25 and the lower welding electrode 22. |
