| 摘要 |
PROBLEM TO BE SOLVED: To form a build-up layer at a high speed using TIG welding capable of achieving the build-up layer of an excellent appearance and an accurate thickness.SOLUTION: When performing build-up welding of a pipe body P by TIG welding, a first torch angle α which is an inclination angle of a welding torch 1 from a vertical line orthogonal to a pipe body circumferential surface with a welding advancing direction in the longitudinal direction of the pipe body P as a + side is set in 0 to 30°, a second torch angle &bgr; which is the inclination angle of the welding torch 1 from the vertical line orthogonal to the pipe body circumferential surface with the welding advancing direction in the circumferential direction of the pipe body P as the + side is set in 0 to 30°, a third torch angle γ which is the rotation angle position of a welding wire 4 with one direction around the axis of the welding torch 1 from the welding advancing direction in the circumferential direction of the pipe body P as the + side is set in 0 to 180°, and a welding temperature is kept at 20 to 100°C. |
