Lap fillet welded joint, automobile component, and manufacturing method of lap fillet welded joint

摘要

Problem to be solved: to provide a manufacturing method of a superimposed fillet welded joint, an automobile part, and a lap fillet welded joint capable of being excellent in fatigue strength of a stop end and further suppressing fatigue crack initiation from a root.The lap fillet welded joint according to an aspect of the present invention isUpper plate of thicknessSuperimposed on the upper plateLower thickness plateEnd surface of said upper plateWeld metal to join the upper plate side surface of the lower plateLap fillet welded joint comprisingThe tip angle measured in the cross section perpendicular to the welding line0 degrees belowThe penetration width measured in the cross section perpendicular to the welding line is2.50 × Over TL;The upper surface of said upper plate and said lower plateAn unfused portion is provided at the end of the lower plateThe shortest distance between the root measured in the cross section perpendicular to the welding line and the surface of the weld metal isMore than th.Diagram