DN200 Project International X42 X52 Gr.B Submerged Arc Welding Pipe

Submerged Arc Welding Ssaw Steel Pipe Project International X42 X52 Gr.B

The direction of the crack and the weld line, and the axis of the steel pipe into a certain Angle, generally between 30-70°.This Angle is just the same as the shear failure Angle, so its bending, tensile, compressive and torsional properties are far inferior to straight seam submerged arc welding.Standardized at the same time, also improve its competition ability, spiral steel pipe, with community, appear across the region, and even across the international production and sales, greatly improving the domestic enterprise market competition ability, increase the sales performance, but also promoting competition, promoted the progress of engineering and technology, spiral tube before molding.

Welding process of spiral welded steel pipe manufacturer:From the welding process, the spiral welded pipe and straight seam steel pipe welding method is consistent, but the straight seam welded pipe will inevitably have a lot of t-shaped weld, so the probability of weld defects is also greatly improved, and the t-shaped seam welding residual stress is larger, the stress state of the weld metal are often in a three-way increases the possibility of a crack.Moreover, according to the technological provisions of submerged arc welding, each weld shall have an arc starting point and an arc extinguishing point, but each straight seam welded pipe cannot meet these conditions when welding the circular seam, so there may be more welding defects at the arc extinguishing point.The welding seam of spiral steel pipe is helical distribution, and the welding seam is long. Especially when welding under dynamic conditions, the welding seam leaves the forming point without cooling, which is easy to produce welding hot crack.