Preventing magnetization of pipe blank in GMA welding

Details Preventing magnetization of pipe blank in GMA welding Preventing magnetization of pipe blank in GMA welding

1979-02-12

1980-12-09

Goldberg, E. A.

Electric heating

Metal heating

Of cylinders

219 66, 219 74, 219123, B23K 3106

Patent

active

042386594

ABSTRACT:
In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the GMA welding process which comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one cable as the welding current, at least two even-numbered consumable electrodes are used, half of said consumable electrodes being connected to said direct current so as to be positive in polarity and the remaining half of said consumable electrodes being connected to said direct current so as to be negative in polarity, to enable lines of magnetic force produced by said direct electric current for welding flowing through said at least one cable introduced into said pipe-blank to cancel each other, thereby preventing magnetization of said pipe-blank and the resulting magnetic arc blow of the welding arc.

REFERENCES:
patent: 3171944 (1965-03-01), Linnandor

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