WELDING PROCESS OF SPIRAL WELDED PIPE

From the welding process, welding method and uniform spiral welded pipe welded steel pipe welded pipe, but inevitably there will be a lot of T weld, so there are chances of welding defects are greatly improved, and the T-shaped seam welding residual stress of weld metal, often in three dimensional stress state, increase the possibility of cracks.

Moreover, according to the provisions of the submerged arc welding process, each weld shall be at the arc and arc quenching, but each longitudinal welded pipe in girth welding, can not meet the conditions, resulting in the arc welding defects may have more.