COMPOUND WELDING METHOD OF LASER BEAM AND ARC, AND GROOVE SHAPE OF WELDED JOINT USED FOR THE SAME

摘要

PPROBLEM TO BE SOLVED: To provide a compound welding method of laser beam and arc capable of obtaining sufficient penetration depth even with laser beams of low output, and a groove shape suitable for the compound welding. PSOLUTION: In the compound welding method in which works 1 and 2 to be welded are butted to each other, and a groove 3 provided on a butted surface is welded by laser beams and arc, an arc welding method is in a short-circuit transfer mode by consumable electrode type gas shield arc, and the laser beam welding and the arc welding are performed with laser beam first and with arc second in the order. A root gap LG of a butted surface of the groove 3 is set to be not less than the spot diameter of laser beams 11, a clearance for forming a key hole is provided, laser beams are irradiated over molten pool 23 formed by the arc welding, and the key hole 12 is formed. Welding is performed by allowing weld metal by the arc welding to flow into the key hole and the clearance for forming the key hole. PCOPYRIGHT: (C)2004,JPO&NCIPI