| 摘要 |
PURPOSE:To prevent relief owing to curving of membrane bars and to improve the accuracy of welding by constituting a titled device of a roll which exerts pressing force upon membrane bars, a moving welding device, and a pulling device for membrane bars. CONSTITUTION:A welder 5 which welds pipes 1 and membrane bars 2, and a press roll 7 which is exerted with pressing force by a pressurizing device 6 such as hydraulic cylinder are disposed in an automatic welding device 4. The roll 7 presses the bars 2 disposed alternately with the pipes 1 on a stand 8. The other end part of the bars 2 is connected to a pulling device 10 such as hydraulic cylinder so that during welding the respective membrane bars are exerted with tensile forces by a fixing device 8 and the device 10. In this state, the device 4 moves in an arrow direction while pressing the bars 2 with the roll 7. Thus the relief of the bars owing to their curving is prevented. |
