| 摘要 |
PURPOSE:To improve the weld quality of the can body by forming a side edge projecting part having a flat main part and the vertical side to the main part on wire electrodes of a welding machine and positioning an edge part of the can body in the neighborhood of the projecting part side to perform the mash- seam welding. CONSTITUTION:The inside and outside wire electrodes 15 and 16 are provided to a mash-seam welding machine and the side edge projecting part 18 having the flat main part 17 and the vertical side 18a is formed to the wire electrode surface in contact with a lap part 12 of a can body perform 11. When the can body edge part 12 is set in the neighborhood of the projecting part side 18a and the resistance welding is performed, the edge part side 18a and the projecting surface 18b control and prevent an irregular protrusion and splash of material. Accordingly, a flat difference part in level is formed to a weld zone and an eliminating stage of a surface treated layer of the edge part 12 is omitted and the weld quality can be improved.
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