| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a laser welding joint more excellent in joint strength than a conventional one. <P>SOLUTION: There is disclosed the laser welding joint formed by joining a plurality of lapped steel sheets where content [P] of P and content [S] of S satisfy [P]+5[S]≥0.026 mass% by laser beam. The laser welding joint has a closed-loop or closed-loop-like real bead with an average bead width of W, a closed-loop or closed-loop-like tempered bead where an inner terminal is arranged at a distance of >W and ≤2.2 W on the inner side from the outer terminal of the real bead, and a closed-loop or closed-loop-like compressing position imparting bead where an outer terminal is arranged at a distance of >1.5 W and ≤4.0 W on the inner side from the outer terminal of the real bead. <P>COPYRIGHT: (C)2013,JPO&INPIT |
