This article analyzes occurrence mechanism and reason of forming weld protruding of spiral submerged arc welded pipe and influence of peaking to protruding of steel pipe,and also put forward effective control method such as draw up the best process parameter,make steel plate edge shape norm,prebending steel plate edge to settle protruding problem.

In accordance with specialty of double wires welding process of inside welding for spiral submerged arc welded pipe,a set of internal welding double wires welding unit is developed.