Overlap fillet arc welded joint, structural component for automobile having said heavy fillet arc welded joint

摘要

PROBLEM TO BE SOLVED: To provide a lap fillet arc-welding joint which improves fatigue strength by suppressing the generation of fatigue breakdown of a welding bead, and an automobile structure component having the lap fillet arc-welding joint.SOLUTION: A lap fillet arc-welding joint related to this invention, where an end 11 of a steel plate 10 with the width of the end 11 of the steel plate 10 narrower than the width of an end of a steel plate 20 is lapped with the end of the steel plate 20 to form a welding bead 30 on the surface 21 of the end 11 and the steel plate 20 along the tip edge of the end 11 of the steel plate 10, has a recess 23 recessed by enclosing to the side face of the end 11 of the steel plate 10, on the surface 21 of the steel plate 20, in accordance with the shape of a lap part of the end 11 of the steel plate 10 to make the welding stop end 33a and the welding stop end 33b of the end 31a and the end 31b of the welding bead 30 in a direction along the tip edge of the end 11 of the steel plate 10 are located on the inclined face 23a of the recess 23.SELECTED DRAWING: Figure 1