METHOD OF MAKING A WELDED CAN BODY

摘要

There is disclosed a method of making a welded can body wherein the opposite marginal edge portions of a metallic blank are overlapped to form a can body preform with an overlapped portion, and then the overlapped portion is electric-resistance mash-seam welded by using a pair of wire electrodes abutting on both the surfaces of the overlapped portion. At least one of a pair of the wire electrodes is formed with a flat main portion (17; 37) and a marginal projection (18; 38) including a slope (18a; 38a) contiguous to the flat main portion (17, 37) on the surface (15a) thereof, which surface (15a) is adapted to abut on the surface of the overlapped portion (12).
The overlapped portion of the can body preform (11) is fed in between the pair of wire electrodes (15, 16; 35, 36) such that the edge face (11a1) of one of the marginal edge portions (11a) may be positioned on an area (17a; 37b) of the flat main surface portion (18a; 38a) in the vicinity of the slope (18a; 38a) or be positioned on the slope (18a; 38a), allowing a blank material beside the edge face (11a1) to flow outwardly in the circumferential direction of the can body preform (11) along the slope (18a; 38a) during the welding.