Method and apparatus for automatically producing thin-walled tub

Details Method and apparatus for automatically producing thin-walled tub Method and apparatus for automatically producing thin-walled tub

1984-05-11

1986-12-02

Goldberg, E. A.

Electric heating

Metal heating

Of cylinders

219 615, 219 60R, B23K 902, B23K 9225

Patent

active

046266445

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 amperage being gradually raised from zero to the steady state values, a steady state step in which the longitudinal welding seam is continuously produced and the welding current amperage is at its steady state value, a third step in which the welding is stopped and the welding current amperage 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 amperage is gradually raised from nearly zero to the steady state value once again. An apparatus for performing the method is also disclosed.

REFERENCES:
patent: 2796508 (1957-06-01), Holman et al.
patent: 3360177 (1967-12-01), Enkvist
patent: 3555239 (1971-01-01), Kerth

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