Fatigue performance improvement method of the fillet weld

摘要

PROBLEM TO BE SOLVED: To provide a fatigability improving method by which D-grade or higher fatigability level can be stably secured by improving fatigue strength both in a root and a toe of a weld bead in existing fillet welding.;SOLUTION: In a bead including a toe of at least one existing regular weld bead which is formed by fillet welding of a base material and a member to be welded, there is newly formed an overlaid weld bead. Then, an ultrasonic impact treatment is performed on the regular weld bead, the toe of the regular weld bead appearing on the surface of the overlaid weld bead, the toe of the overlaid weld bead, and the toe of the boundary between the regular weld bead and the overlaid weld bead.;COPYRIGHT: (C)2008,JPO&INPIT