The production process of the large diameter LSAW steel pipe of hot rolled coil after forming machines, coil deformation for a smooth cylindrical, straight seam welded pipe is a gas pipeline in the common pipe diameters greater than 426mm (or 508mm) the pipe is generally known as longitudinally welded pipes of large diameter.
Accoring to Welding into a tube, can be divided into DSAW steel pipe and Longitudinal two. High-frequency current skin effect and proximity effect or flux layer burning arc welding, the tube edge of the heating and melting and fusion, the final cooling effect of the extrusion pressure molding. Which the tube edge melting of high-frequency current is called ERW (ERW), using arc melting is called LSAW pipe (LSAW). Longitudinal main raw material is low carbon steel hot rolled coil, hot rolled, low pressure gas transmission, petroleum, metallurgy, construction, coal mines, ports, machinery and other industries, and oil and gas transportation, mine liquid with The conveyor roller, automotive transmission.
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