ERW is the abbreviation of Electric Resistance Welding. Chinese means resistance welding. The ERW pipe often referred to in the steel pipe industry refers to electric resistance welded pipe. The ERW welded pipe production line can produce high-frequency resistance longitudinal welded pipes, square pipes, rectangular pipes, steel sheet piles and other products.
Electric resistance welding is a kind of pressure welding, in which the edge of the weld is heated to the welding temperature and pressure welds the welded pipe of the composite pipe. It is divided into low frequency and high frequency. Unlike ordinary welded pipe welding process, the weld is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of ordinary welded pipe. The welding methods of erw pipes and submerged arc welded pipes are significantly different. The pressure welding method without filler metal is adopted. There are no other components filled in the weld. The skin effect and proximity effect of the high-frequency current make the edge of the plate instantaneously heated. When the welding temperature is reached, the welding seam of the forging structure is formed by the extrusion roller. High-quality steel pipes require on-line or off-line heat treatment of welds to refine the weld zone structure. The welds of high-quality erw welded pipes can reach the same toughness level as the base metal, which cannot be achieved by submerged arc welding.
ERW stands for electric resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation. Therefore, it is widely used in aviation, aerospace, energy, electronics, automotive, light industry and other industrial sectors. It is one of the important welding processes. One. It is especially used to transport oil, natural gas and other vapor and liquid objects, which can meet various requirements of high and low pressure. Currently, it occupies a pivotal position in the field of transportation pipes in the world.