Patent ID: 7408130

Claim:
A combined welding method with a filler wire using both a YAG laser and an induced arc, comprising: directing a laser irradiation position of a YAG laser on base materials to be welded by a filler wire; dividing an internal space of a hood covering a welding surface of the base materials to be welded into a welding space which faces the welding surface and a gas feed space on an opposite side of the welding space from the welding surface by a member for straightly flowing a gas having plural openings from the gas feed space to the welding space; connecting a power source for applying voltage for the filler wire between the filler wire and the base materials to be welded; irradiating the YAG laser on the base materials to be welded, whereby a keyhole is generated at an irradiated portion of the welding surface of the base materials, and a plasma-activated gas and a metal vapor are generated; feeding the filler wire in a vicinity of the generated plasma-activated gas and the metal vapor, whereby an arc is induced to the filler wire by a function of the plasma-activated gas and the metal vapor; feeding the filler wire to a welding portion of the base materials to be welded; and welding using both the YAG laser and the induced arc while holding the plasma-activated gas and the metal vapor in the keyhole, wherein the YAG laser is irradiated to the base materials through the hood and the openings of the member for straightly flowing the gas, and a shielding gas is fed to the gas feed space, whereby a shielding gas atmosphere is set in a vicinity of the laser irradiation position and the edge of the filler wire through the member for straightly flowing the gas, and the plasma-activated gas and the metal vapor in the keyhole in all directions is suppressed by the shielding gas.