High frequency straight seam welded pipe (ERW) is the hot rolled coil plate formed by the forming machine, using the skin effect and proximity effect of high frequency current to heat and melt the edge of the tube blank, and pressure welding under the action of the squeeze roller To achieve production. The high-frequency resistance welding method was applied to the production of welded pipes in the 1950s. In the past ten years, its production technology has become more and more perfect, and product quality has been continuously improved. The first is that the quality of raw materials used in ERW production has been significantly improved.

Secondly, the automatic control of the computer is realized in the production process of large and medium-caliber ERW steel pipe forming welding heat treatment, and the heat input energy during the high-frequency welding process is effectively controlled with the computer’s automatic compensation system, preventing the welding heat input energy from being low The resulting cold welding, virtual welding and overheating caused by high heat input energy.