Finego - Model LSAW/SAWL -Welded Steel Pipe

LSAW steel pipe (Longitudinally Submerged Arc Welding abbreviated LSAW) is a professional expression term for longitudinally submerged arc welding, which is made of a single medium and thick plate as raw material, the LSAW steel plate is pressed (rolled) into a tube billet ina mold or forming machine, and is produced by double-sided submerged arc welding and expanded diameter.

Longitudinally Submerged Arc Welding Pipe is subdivided into UOE, RBE, JCOE pipe according to its different forming methods. Longitudinal high-frequency welded steel pipe has the characteristics of relatively simple process and fast continuous production, and has wide use in civil construction,petrochemical, light industry and other sectors. Mostly used to transport low pressure fluids or made into various engineering components and light industrial products.

SAWL pipe or Submerged Arc Welding Longitudinally steel pipe is a kind of straight seam steel pipe. The welding process used is submerged arc welding technology, which is welded with filler and submerged arc with particle protection flux. The production process of submerged arc welded pipe includes JCOE forming technology and rolling forming submerged arc welding technology. When the diameter is large, two steel plates may be used for rolling, which will form a phenomenon of double welds.

1. The pipe internal stress is very small and uniformly distributed after the full- length expansion. The corrosion and cracking of the pipe owing to stress can be effectively prevented. The application of welding on site is very easy because of the high dimension precision;
2. The inside and outside welding are performed after the tack welding, so the welding process is very stable with good weld quality;
3. The NDT is easy to perform on the weld during production and field operation as well;
4. The length of the weld is shorter than that of the non-longitudinal seam pipe, so the probability of defects occurrence is very low;
5. The coverage of the pipe specification is very wide. The pipe can be either in large diameter with thick wall or in small diameter with thick wall.