| 摘要 |
PURPOSE:To prevent the exposure of welded flash to the surfaces of upper and lower skin materials when the protruding parts of the upper and lower skin materials protruding toward the rear surface in such a state that the end edge parts of both skin materials come into contact with each other are held between a pair of welding electrodes to be welded. CONSTITUTION:Recessed molten matter receiving parts 49 receiving molten matter generated by melting upper and lower skin materials 9, 11 are provided to the welding surfaces 47, 47 of a pair of welding electrodes 41A, 41B. The molten matter is received in the molten matter receiving parts 49 without flowing out to the surface of a skin material. |
