| 摘要 |
PROBLEM TO BE SOLVED: To provide a pierce metal for dissimilar junction and a dissimilar junction method such that adhesion of a junction boundary surface between a steel plate and an aluminum alloy plate 30 is obtained and excellent spot welding is achieved.SOLUTION: A piece metal 1 has, on a tip surface 24 of a shaft part 20, a welding projection 25 and a heating projection 26 differing in projection height. The heating projection 26 and a steel plate 40 at the part soften in a junction initial stage in which the pierce metal 1 and steel plate 40 are held and pressurized and supplied with electricity, and boundary surfaces of the aluminum alloy plate 30 and steel plate 40 are made to adhere to each other by causing an iron-based material 40 and the welding projection 25 to abut on each other with small pressurizing force so as to prevent rigidity from decreasing, thereby easily and excellently welding a shaft tip face 24 of the pierce metal 1 and the steel plate 40 in a following welding latter-half stage.SELECTED DRAWING: Figure 1 |
