REEZAYOSETSUHOOYOBIKORENISHOSURUREIKYAKUHETSUDO

摘要

PURPOSE:To increase a penetration depth by suppressing the generation of plasma and to reduce the cost of welding by using Ar as a shielding gas. CONSTITUTION:A laser beam B is cast toward the part 2a to be welded of a material 2 to be welded from a torch 1 and a first shielding gas G1 is injected. A cooling head 3 is disposed between the torch 1 and the material 2 to be welded. The cooling head 3 has a beam passage hole 3a to allow the passage of the laser beam B and a second shielding gas G2 is injected from nozzles 3d and 3e toward the material 3 to be welded. The metal vapor blowing up from the part 2a to be welded is cooled by the cooling head 3 and the metal vapor spouting upward of the cooling head 3 through the beam passage hole 2a is cooled by the first shielding gas G1.