The manufacturing of spiral weld pipes with 2-Step technology corresponds with the technique of longitudinal welded pipes, where pipe forming is separated from the submerged-arc welding process.
After pipe forming and continuous tack-welding on the Spiral Pipe Machine, the pipe is transferred to the Submerged-Arc Final Welding Machines (FWM), where the tack-welded pipe seam is permanently (final) welded using the multi-wire submerged-arc welding process.
The main difference between the Tack/Spiral Welding Machine and traditional type is the cutting ring. The cutting ring adpots plasma cutting technology, which could match with the pipe moving and rotating speed. This device can increase the speed of tack pipe line to 6-8m/min.
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