LASER WELDING METHOD

摘要

In the present invention, laser welding is performed with two laser beams transmitted using different optical fibers and having a correctly focused spot diameter of at least 0.3 mm being radiated from the top surface side of a material to be welded along the weld line, a preceding laser beam that precedes in the direction of welding progress at the top surface side of the material to be welded and a subsequent laser beam that is subsequent being provided with an angle of incidence from the perpendicular direction to the top surface of the material to be welded, radiating while tilted in the direction of welding progress, and the angle of incidence of the preceding laser beam being caused to be greater than the angle of incidence of the subsequent laser beam.