| 摘要 |
PROBLEM TO BE SOLVED: To improve the difficulty of a root pass of a conduit and a pipe, and to improve the efficiency thereof. SOLUTION: Build-up welding is performed to increase the thickness by a method of using a backing or the like which is not melted by a welding heat source on a joined end face part of a member without using any backing or any backing strip during the joint welding. A member end part of a part to be welded of the joint is grooved, the part to be welded is abutted on a counter member when executing the joint welding, cut wires or iron powder is filled in the groove part. Thereby, the effective throat thickness exceeding the thickness of the member is obtained, and the joint welding is performed by determining an exclusive welder of a welding joint layer or a pass. |
