Longitudinal Submerge-arc Welded pipes shortly for LSAW pipe is a kind of steel pipe whose welding seam is longitudinally parallel to the steel pipe, and the raw materials is steel plate, so the wall thickness of the LSAW pipes can be much heavier for example 50mm, while the outside diameter limited to 1420mm utmost. LSAW pipe has the advantage of simple production process, high production efficiency, low cost.
Double Submerged Arc Welded (DSAW) pipe is a kind of spiral welding seam steel pipe made of steel coil as raw material, often warm extrusion and welded by automatic double-sided submerged arc welding process. So the single length of the DSAW pipe can be 40meters while the single length of the LSAW pipe is only 12 meters. But the maximum wall thickness of the DSAW pipes can be 25.4mm only due to the limitation of the hot rolled coils.
An outstanding feature of spiral steel pipe is that the outer diameter can be made very large, Cangzhou Spiral Steel Pipes Group Co.ltd can produce large diameter pipes with outside diameter 3500mm utmost. During the forming process, the steel coil is deformed evenly, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has greater flexibility in the size range of diameter and wall thickness, especially in the production of high-grade, big wall thickness pipe, and small diameter with big wall thickness pipe, which has incomparable advantages over other processes. It can meet more requirements of users in spiral steel pipe specifications. The advanced double-sided submerged arc welding process can realize welding at the best position, which is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality. However, compared with the straight seam pipe with the same length, the weld length increases by 30 ~ 100%, and the production speed is low.
Post time: Nov-14-2022