Method for longitudinally welding pipe-blank for welded...

B - Operations – Transporting – 23 – K

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B23K 9/02 (2006.01) B23K 9/073 (2006.01)

Patent

CA 1080812

ABSTRACT OF THE DISCLOSURE An improvement is provided in a procedure for longitudinally seam-welding a pipe-blank for welded steel pipe , from the inside along a cleft or groove by the reverse-polarity GMA welding pro- cess. Direct electric current is used as the welding current whic is supplied to a consumable welding electrode through a cable as the welding current with the consumable electrode being maintained positive in polarity. The pipe-blank for welded steel pipe is longitudinally seam welded from the inside along a cleft or groove by feeding the consumable electrode through a welding torch while moving a boom carrying the welding torch through the pipe-blank relative to the pipe-blank in the same direction as that of welding, the boom having a free end which carries the welding torch, and a length at least equal to that of the pipe- blank. The improvement comprises the steps of: arranging the cable in the pipe-blank in a predetermined direction; and supply- ing the direct electric welding current in such a direction that the welding current flowing through the cable flows in the same direction as the direction of welding, thereby substantially preventing the occurence of a magnetic arc blow of the welding arc from the consumable electrode toward the upstream side of the welding direction, i.e., in the opposite direction to that of welding. The weld thus provided is sound and substantially free from welding defects.

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