Method of pipe welding

Details Method of pipe welding Method of pipe welding

B - Operations, Transporting

23

K

B23K 9/09 (2006.01) B23K 9/028 (2006.01) B23K 9/10 (2006.01) B23K 9/133 (2006.01) B23K 10/02 (2006.01) B23K 35/30 (2006.01)

Patent

CA 2314058

A method of welding the ends of two metal workpieces at the open root between the spaced ends, said method comprising: (a) selecting a welding wire containing phosphorous, sulfur, and carbon; (b) maintaining the sulfur at a given percentage level of the selected wire; (c) maintaining the phosphorous at a given percentage level of the selected wire; (d) advancing the welding wire at a given wire feed rate toward the open rot to weld the ends together by at least partially filing the open root in a first weld pass; (e) creating a welding current with a controlled waveform, the waveform including a succession of welding cycles each having a short circuit portion and a plasma arc portion; (f) moving the welding wire along the open root as the welding current is passed through the wire to melt the wire and transfer the melted wire to the ends in said open root.

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