| 摘要 |
PURPOSE:To obtain a can body having no weld defects in the stage of subjecting a formed body having a surface-treated film to mush-seam welding between electrode rolls by running wire electrodes in such a manner that the side faces of the shallow grooves formed to the wire electrodes are positioned on the superposed part of said body. CONSTITUTION:The opposed 1st end 1a and 2nd end 1b of a metallic blank are superposed except the surface treated film layer 2 to form the formed body of a can body. The superposed part 4 is then subjected to electric resistance mush- seam welding by a pair of electrode rolls 5, 6 via the wire electrodes 7, 7' formed with the shallow grooves 8a-8c and 9a-9c extending longitudinally. The electrodes 7, 7' are run on the rolls 5, 6 in such a manner that at least one piece each of the side faces 8a1-8c1 and 9a1-9c1 of the shallow grooves on the part 1c side of the body 1 are positioned on the part 4. The can body having the defectless weld zone at the substantially equal width is thus produced. |
