METHOD FOR ENHANCING TENSILE STRENGTH OF SPOT WELDED JOINT BY ULTRASONIC SHOCK TREATMENT

摘要

PROBLEM TO BE SOLVED: To provide a treating method for enhancing tensile strength of welded joint while ensuring good workability in a spot welded joint of high strength steel sheet.;SOLUTION: In the method for enhancing the tensile strength of the welded joint formed by spot welding the high strength steel sheet, ultrasonic shock treatment is applied to one or both of a nugget portion and a portion around the nugget from both surface or one surface of the welded joint.;COPYRIGHT: (C)2004,JPO