LASER AND ARC COMPOUND WELDING METHOD AND GROOVE OF METAL PLATE FOR BUTT WELDING

摘要

PROBLEM TO BE SOLVED: To prevent molten metal from hanging down and falling down in a sphere shape from a welding portion when the metal plates are mutually butted at the grooves of the metal plates and are welded.SOLUTION: In a region of one groove to be butted, where welding is carried out in one pass, protrusion portions 92a and 92b, and a depressed portion 91 are continuously formed along a long-side direction of the groove. Then, in the groove where the protrusion portions 92a and 92b, and the depressed portion 91 are formed, a metal plate 15 is arranged so that only tip surfaces of the protrusion portions 92a and 92b are butted to the groove to be butted. Thereafter, laser arc hybrid welding is carried out using, as an aiming position of a laser beam 16 and a wire 17, positions on an intersection 96 of a surface 95 including a center region of a gap between the grooves formed by the depressed portion 91, and an edge portion of a side irradiated by the laser beam 16 in a region where the protrusion portion 92 and the depressed portion 91 are formed.