Method of pipe welding
AssigneeLincoln Global, Inc.
InventorsPeter Nicholson, Elliott K. Stava
Life of this patent
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Abstract
A method of welding the ends of two pipes at the open root between the spaced ends by an STT electric arc welder, which comprises: selecting a welding wire having 0.06-0.15% by weight carbon, 0.90-1.40% by weight manganese, and 0.45-0.75% by weight silicon, as well as phosphorous, copper, stainless steel alloys and sulfur; maintaining the sulfur at a given percentage level of the selected wire in the specific range of 0.015 to 0.035% by weight; and maintaining said phosphorous at a given percentage level of said selected wire in the specific range of less than about 0.015%.
Claims27
A method of welding the ends of two metal workpieces at the open root between said spaced ends, said method comprising:
- (a) selecting a welding wire containing phosphorous, sulfur, and carbon;
- (b) maintaining said sulfur at a given percentage level of said selected wire;
- (c) maintaining said phosphorous at a given percentage level of said selected wire;
- (d) advancing said welding wire at a given wire feed rate toward said open root to weld said ends together by at least partially filing said open root in a first weld pass;
- (e) creating a welding current with a controlled waveform, said waveform including a succession of welding cycles each having a short circuit portion and a plasma arc portion;
- (f) moving said welding wire along said open root as said welding current is passed through said wire to melt the wire and transfer the melted wire to said ends in said open root.
Dependencies are inferred from the claim text.