To provide the method which can easily secure a space for discharging a vaporized metal in laser welding of a metal plating steel sheet.
In order that a space in the maximum flying height of X is generated between two flange sections when one flange section 4 made of steel sheet and another flange section 5 made of metal plating steel sheet both of which are subjects for welding are lapped one over the other, a tip of one flange section 4 is beforehand bent obliquely from the part close to the welding position W which constitutes a bending base 6a, thereby forming an oblique part 6. By having the oblique part 6 stuck and held to the flange section 5 with the bending base 6a as a supporting point under the condition that the flange sections 4 and 5 are lapped one over the other, a space 8 as large as G is generated between the flange sections 4 and 5 at the welding position W. The welding position W is irradiated with a laser beam Lb for welding under the condition that the space 8 is generated.
Hiromichi Kobayashi
Tomioka Kiyoshi