| 摘要 |
PURPOSE:To enhance strength of the welded member by making arrangement so that the bend outside of a work is superposed on the bend inside of a mating work and irradiating superposed bends with a laser beam to perform welding. CONSTITUTION:In the radius R1 of curvature of a bend 13b and the radius R2 of curvature of a bend 14b of a side frame outer 13 and a reinforcement 14, R1<=R2 is formulated. When arrangement is made so that the bend 13b outside is superposed on the bend 14b inside, a close adhesion part 16 where both are completely adhered is generated. A laser beam torch is arranged on the position in opposition to the outside of the bend 14b and the close adhesion part 16 is irradiated with the laser beam. Since the side frame outer 13 and the reinforcement 14 are welded together at the bends 13b and 14b which are inward parts than flange parts 13a and 14a of both side ends, strength can be enhanced. In addition, the width of the flange parts 13a and 14a can be narrowed. |
