| 摘要 |
PURPOSE:To perform stable welding which is uniform overall by adding the 2nd pressurizing means which suppresses and absorbs only the hopping phenomenon aside from a means for pressurizing a roller electrode necessary for welding. CONSTITUTION:The pressure force necessary for mush-seam welding is exerted to an upper roller electrode 2 for welding by means of a spring 5. The 2nd pressure means consisting of a magnet 11 mounted to an arm 9 fixed to the body of a welding machine, an attraction plate 12 and a pressing bar 6 is provided in the central part of the spring 5. A clearance approximately the same as the superposed thickness of a can body 1 which is the work is provided between the bar 6 and a bracket 4. The bar 6 is fitted to the plate 12 and is held to a pressure regulating screw 8 in a loosely fitted state. If a short sized can is welded at a high speed by this, an electrode 2 is kicked up impulsively when the can 1 is gnawed between the electrodes 2 and 3, and the bar 6 is forced upward by the inertia thereof by overcoming the electomagnetic force of the plate 12. At this same instant, the inertia force is absorbed by the electromagnetic attraction force therefore and therefore the kicking up is substantially suppressed and the generation of the hopping phenomenon is obviated. |
