| 摘要 |
PURPOSE:To execute whole circumference welding, by constituting a support of a work jig on a turntable of upper, intermediate and lower supports, forming the intermediate support by a crank type, making a torch contact with the intermediate support, and making in turn in the direction opposite to the turntable. CONSTITUTION:A support 6 of a work jig 3 is constituted of an upper support 60, an intermediate support 61 and a lower support 62, and also the intermediate support 61 is constituted of 2 crank-type constituent supports 61a, 61b, and is connected so as to rotate in the radial direction against the upper support 60 and the lower support 62. Accordingly, even if a torch 10 contacts with the intermediate support 61 which moves, following a rotation of a turntable 2, the constituent supports 61a, 61b of the intermediate support 61 turn, following the rotation of the turntable 2, by contact force, and rotate a work 15 by 360 degrees without exerting a hindrance on the torch 10. |
