Method for producing longitudinal-seam-welded rounded bodies

Details Method for producing longitudinal-seam-welded rounded bodies Method for producing longitudinal-seam-welded rounded bodies

B - Operations, Transporting

23

K

327/67, 327/78,

B23K 11/24 (2006.01) B23K 11/06 (2006.01) B23K 11/08 (2006.01)

Patent

CA 1156318

ABSTRACT Longitudinal seams in cans are welded using a resistance-welding machine having a pair of roller electrodes which engage overlapping portions of the cans as they are conveyed past the electrodes. Welding power in the form of an approximately square wave the frequency of which is related to the number of cans passing the electrodes in a particular time interval specifi- cally each half-wave or half-cycle lasts as long as it takes for a can to pass the electrodes. The half-cycles may alternate from can to can or may be unidirectional square waves. A higher frequency current component may be superimposed on the basic square wave. Current passed through each can is unidirectional and essentially constant but the overall supply is pulsed and may be alternating and so that the process is a quasi direct-current welding process with advantages deriving from both d.c. and a.c. techniques.

370688

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