| 摘要 |
PURPOSE:To stabilize the welding quality by providing the switch jig having a pair of profiling rollers on a shield box and performing the control of the welding torch corresponding to the eccentricity of a steel pipe via the opening and closing of a limit switch. CONSTITUTION:A pin 12 is fitted freely rotatably to the shield box 8 arranging the switch jig 13 integrated with profiling rollers 11a, 11b to a welding torch 2. Limit switches 9a, 9b are fixed to the box 8 pinching a switch working lever 14. In case of a round steel pipe 4a being eccentric with its dead weight the jig 13 is rotated to turn ON the switch 9a of one part. In this case a signal generater 16 outputs to a driver 17 by receiving this signal, correcting the welding torch 2 by driving a motor 15. In case of the movement of the welding point being opposite the switch 9b works similarly. In this way, the torch 2 is always held in a normal position and the welding quality is stabilized.
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