MANUFACTURING METHOD OF MIG WELD JOINT OF STEEL MATERIAL AND ALUMINUM MATERIAL AND MIG WELD JOINT OF STEEL MATERIAL AND ALUMINUM MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a MIG weld joint made of a steel material and an aluminum material which enables beads across the steel material and the aluminum material to be continuously formed along the end surface of the steel material at a welding part irrespective of the presence or absence of surface processing at the end surface of the steel material, and also to provide a MIG weld joint having continuous beads.;SOLUTION: The steel material 12 having a thickness t of 0.50-2.0 mm which is 0.6-0.8 times thicker than that of the aluminum material 14 and a welding wire 30 having a radius r of 0.4-0.8 mm and made of aluminum alloy of a 4000 material or a 5000 material are respectively used. In a state that the steel material 12 and the aluminum material 14 are overlapped with each other with the steel material 12 as an upper part and the welding wire is arranged so as to satisfy 0≤L/r≤4, the welding wire is relatively moved so as to satisfy 4.0≤L/r+(t/α)×V≤6.0, while executing a predetermined direct current pulse MIG weld operation on it, a lap fillet joint is manufactured.;COPYRIGHT: (C)2010,JPO&INPIT