LASER WELDING METHOD, WELDING MEMBER AND FUEL INJECTION VALVE

摘要

PROBLEM TO BE SOLVED: To suppress porosity in deep weld penetration type (keyhole mode) laser welding in which the weld penetration depth is shallow and a continuous weld part is required.SOLUTION: In a laser welding method for welding a material to be welded by deep weld penetration type laser welding by irradiating the material with a laser beam whose laser output is periodically changed, a laser irradiation time Tp is set to agree with a formation time until a keyhole reaches a required weld penetration depth, and a laser suspension time Tb is set to be shorter than a time until an intermediate part of the keyhole is closed.