B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
78/48
B21C 37/08 (2006.01) B23K 9/025 (2006.01) B23K 31/02 (2006.01)
Patent
CA 1224649
METHOD AND APPARATUS FOR AUTOMATICALLY RESTARTING THE LONGITUDINAL WELDING SEAM FOR PRODUCING THIN-WALLED TUBES FROM A SHAPED METAL TAPE, MORE PARTICULARLY FOR CABLE SHEATHING ABSTRACT A method for restarting the longitudinal welding seam when producing thin-walled tubes from a metal tape comprises the steps of starting welding with the tape in motion and the welding current ampere being gradually raised from zero to the steady state values steady state step in which the longitudinal welding seam is continuously produced and the welding current ampere is at its steady state value, a third step in which the welding is stopped and the welding current ampere is gradually decreased from its steady state value to nearly zero, and a restarting stage in which the welding seam is overcast partially behind the point at which it had been stopped and the welding current ampere is gradually raised from nearly zero to the steady state value once again. An apparatus for performing the method is also disclosed.
454159
Cise - Centro Informazioni Studi Esperienze S.p.a.
Marks & Clerk
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