Overlay welding method and overlay welding apparatus

An overlay welding apparatus that includes a bottomed depression provided to a base material and performs overlay welding, while designating the circumferential surface of the depression as a surface to be overlaid, the apparatus comprising:

• a filler material feeder that feeds a filler material;
• a beam irradiation unit that irradiates a laser beam, which becomes a heat source for melting the filler material;
• a shielding gas feeder that feeds shielding gas to an atmosphere in which a filler material is melted by a laser beam;
• a rotation unit that rotates the base material around a center line of the depression;
• and
• a moving unit that supports the filler material feeder and the beam irradiation unit so that a feeding position of a filler material fed by the filler material feeder and an irradiation position of a laser beam irradiated by the beam irradiation unit reach a bottom face of the depression, while being away from the center line of the depression, and moves the feeding position of the filler material and the irradiation position of the laser beam along the center line of the depression.

An overlay welding apparatus that includes a depression formed of a circular annular groove provided to a base material and performs overlay welding, designating the depression as a groove for welding, the apparatus comprising:

• a filler material feeder that feeds a filler material;
• a beam irradiation unit that irradiates a laser beam, which becomes a heat source for melting the filler material;
• a shielding gas feeder that feeds shielding gas to an atmosphere in which a filler material is melted by a laser beam;
• a rotation unit that rotates the base material around a center line of a circular annular groove in the depression;
• and
• a moving unit that supports the filler material feeder and the beam irradiation unit so that a feeding position of a filler material fed by the filler material feeder and an irradiation position of a laser beam irradiated by the beam irradiation unit reach a bottom face of the depression, and moves the feeding position of the filler material and the irradiation position of the laser beam around the center line of the circular annular groove in the depression.