FORMATION OF WELDED END PART, APPARATUS FOR FORMING WELDED END PART AND WELDED MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a forming method of a welded end part with which a shearing crack on a bending portion is not induced and a joggling work in the welded end part can be executed at low cost while improving fatigue service life with the stress release. SOLUTION: The welded end part 6 is interposingly pressed with an upper die 13 for pressing a prescribed portion L from the end surface 7 and a lower die 12 pressing a part while leaving a prescribed portion N from the end surface 7 unpressed. The pressed portion with the upper die 13 and lower die 12 is overlapped at the overlapping part M. The welded end part 6 with the interposing press is plastically deformed under a compression stress field toward this tip end direction. The plastic deformation is defined with the tip end abutted surface 15 and the lower end abutted surface 14 to form the end surface 7 and an end part plate surface 8. In the overlapped part M, the round parts (R) 16, 17 are formed in the lower die 12 and the upper die 13, respectively.