Method and apparatus for seam-welding steel pipes

Electric heating – Metal heating – Of cylinders

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Details

219 602, 219 60R, 219123, 174 15WF, B23K 902

Patent

active

043419380

ABSTRACT:
A method of longitudinally seam-welding steel pipes comprises the steps of providing a conductive net-like enclosure tube around a cable for supplying a direct electric current from the power source to the welding head; and conducting a direct electric current through the enclosure tube and through the steel pipe in a direction opposite to that in which the direct current runs through the cable. Apparatus for longitudinally seam-welding steel pipes comprises an electrical cable coupled to a welding head, a net tube surrounding the cable, and a device for supplying a direct electric current to the cable in a first direction and to the net enclosure tube and steel pipe in the opposite direction. The direct currents flowing in the enclosure tube and in the steel pipe is adjustably controlled to minimize the magnitude of a magnetic field created around the net enclosure tube and producing a welded steel pipe seam.

REFERENCES:
patent: 1625125 (1927-04-01), Latour
patent: 3147389 (1964-09-01), Carlson
patent: 4107503 (1978-08-01), Koshiga et al.
patent: 4145594 (1979-03-01), Koshiga et al.
patent: 4238659 (1980-12-01), Koshiga et al.

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