ERW pipe is also called straight seam resistance welded pipe. The MS ERW pipe usually produces a smaller diameter, usually in the case of DN600. Large diameter submerged arc welded steel pipe is generally double-sided. The utility model has the advantages of fast welding speed, small welding heat affected zone, unclean workpiece, thin-walled pipe welding and metal pipe welding. Pipeline technology: slitting opening - steel flat - head and tail shear band docking - sliding - storage - formation - Welding - deburring - dimension - Inspection - flight - first inspection - steel straightening - segment processing - hydraulic testing - flaw detection - printing and coating - finished products. Pipelines are mainly used in water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation and urban construction.


Owing to technological progress for more than ten years, ERW pipeline has been continuously improved, so its application scope has expanded rapidly. Its main advantages are:


One. There is no chemical composition added in the welding process of straight seam high frequency resistance welded steel pipe. The welding quality mainly depends on the quality of base metal. In recent years, due to the continuous improvement of the quality of hot rolled coil, the welding quality has been improved in the process of pipe making. Even if the welding quality is slightly poor, it will not affect the quality of the whole steel pipe.


In recent years, due to the progress of automation technology, the main parameters of resistance welding can be optimized by computer control, thus greatly improving the welding quality.


C. Longitudinal high frequency resistance welded steel pipe has low residual stress and high strength.


D. Longitudinal high frequency resistance welded steel pipe has high geometric accuracy, which is convenient for field installation, butt welding and anti-corrosion construction.


That is to say, the straight seam high frequency resistance welded steel pipe has short beads, which means that the reliability is improved.


F. Longitudinal seam high frequency resistance welded steel pipe has price advantage, its price is far lower than that of straight seam double-sided submerged arc welded steel pipe. However, due to the lack of welding quality of straight seam high frequency resistance welded steel pipe, external anti-corrosion treatment is needed.