METHOD OF AND DEVICE FOR BUTT WELDING IN YAG LASER WELDING MACHINE

摘要

PURPOSE:To improve welding productivity by executing the welding, inserting and correction welding of a filler metal by the sheet metal butt welding of a YAG laser welding. CONSTITUTION:The filler metal is supplied from a 1st nozzle 3 to butt parts 13A, 13B of a work W and is irradiated with a laser beam from a 1st optical fiber 9, by which the filler metal is welded. Gas is supplied from a 2nd nozzle 17 and the welded butt parts are irradiated with a laser beam from a 2nd optical fiber 23 and are thereby filled and completely welded; thereafter, the weld zone is irradiated with the laser beam from a 3rd optical fiber 29. The weld zone is thereby improved in quality and trimmed. The weld defect by the fluctuation in the butt parts is prevented in this way and the productivity is improved.