WELDING DEVICE, WELDING METHOD, AND TURBINE BLADE

摘要

Provided is a welding device provided with a cylindrical powder nozzle (201) for supplying powder gas, which includes a powdered welding material, toward a position of laser light irradiation on base material and a cylindrical shield nozzle (202) positioned coaxially so as to cover the outer peripheral surface of the powder nozzle (201) for supplying shielding gas for isolating the position of laser light irradiation. The outer peripheral surface (201b) in the vicinity of a tip part (201a) of the powder nozzle (201) has a shape wherein the diameter decreases gradually toward the tip part (201a) of the powder nozzle (201), and the cross-sectional shape is an arc shape in a cross-section through a center axis (A) of the powder nozzle (201).