Thick plate welding method by combination of laser welding and TIG welding or MIG welding

摘要

PROBLEM TO BE SOLVED: To provide a welding method which makes a deformation rate as small as possible and maintains high welding strength. SOLUTION: Combined welding of inserting a laser welding torch into a root zone, irradiating the narrow zone in particular with the laser beam which makes combination use of an optical fiber, mirror, etc., is accordance with the kinds of the laser to perform welding which is little in the deformation accompanying the welding, and welding a groove exclusive of the root zone is performed by inserting a TIG welding torch or MIG welding torch in combination.