B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/40
B23K 9/12 (2006.01)
Patent
CA 1097748
ABSTRACT OF THE DISCLOSURE An improvement is provided in longitudinally seam-welding a pipe- blank for welded steel pipe from the inside along a groove or cleft by the metal arc welding process. That process comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one current supply cable as the welding current. An even number of consumable electrodes are used. Half of the even-numbered consumable electrodes are connected in the reverse-polarity manner, i.e., to be posi- tive in polarity, and are used as leading electrodes, and the remaining half are connected in the straight-polarity manner, i.e., to be negative in polarity, and are used as trailing electrodes. The GMA welding process is applied on the side of the reverse-polarity consumable electrodes which are the leading electrodes. The submerged-arc welding process is applied on the side of the straight-polarity consumable electrodes which are the trail- ing electrodes. By this technique magnetization of the pipe-blank and the resulting magnetic arc blow of the welding arc is substantially prevented by causing lines of magnetic force produced by the direct electric currents for welding flowing through the current supply cables introduced into the pipe-blank to cancel each other. This technique also substantially pre- vents spattering of molten droplets from the straight-polarity consumable electrodes.
341274
Koshiga Fusao
Suzuki Motoaki
Takamura Toshihiro
Tanaka Jinkichi
Watanabe Itaru
Marcus & Associates
Nippon Kokan Kabushiki Kaisha
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