WELDING DEVICE, WELD METHOD, AND TURBINE BLADE

摘要

PROBLEM TO BE SOLVED: To provide a welding device that can carry out high-quality padding using laser by suppressing the generation of a large-scaled eddy structure in a sealed gas.SOLUTION: A welding device is provided which comprises a cylindrical powder nozzle 201 that supplies a powder gas containing a powder welding material to a laser beam irradiation position of a base material and a cylindrical shield nozzle 202 coaxially arranged so as to cover the outer peripheral surface of the powder nozzle 201 to supply a shield gas for isolating the laser beam irradiation position. An outer peripheral surface 201b of the powder nozzle 201 in a vicinity of a tip 201a has a shape that the outer diameter gradually diminishes toward the tip 201a of the powder nozzle 201 and a shape that the cross section passing through a center axis A of the powder nozzle 201 is a circular arc.