| 摘要 |
PROBLEM TO BE SOLVED: To enable copy welding with the angular change on a detection end of a detector to detect a second member to be welded when welding the second member with the continuously changing angle to a first member to be welded. SOLUTION: In a method for spirally welding a fan-shaped plate 4 to a steel tube 2, a movable supporting body 30 is moved so that a second detector and a welding torch are located opposite to each other across the fan-shaped plate by using a welding torch 40 and a first detector 50 fixed to the movable supporting body 30 which is movable in the vertical, longitudinal and right-to-left directions with respect to the steel tube and the fan-shaped plate, and a second detector 60 supported by an upper movable supporting body movably with respect to the first detector. While a detection end 51 of the first detector is brought into contact with an outer circumferential surface of the steel tube and a detection end 61 of the second detector is substantially opposite to a tip part of the welding torch across the fan-shaped plate, the welding torch is moved along a part to be welded, and the welding torch, the first detector and the second detector are integrally moved to perform the welding. COPYRIGHT: (C)2005,JPO&NCIPI
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