ERW welded steel pipe

ERW straight seam welded pipe
ERW straight seam welded pipe, also known as "resistance welded straight seam welded pipe", ERW straight seam welded pipe is mainly divided into two forms: ERW AC welded steel pipe and ERW DC welded steel pipe. ERW straight seam welded pipes are divided into low frequency welding, medium frequency welding, super medium frequency welding and high frequency welding according to different frequencies. High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary-walled steel pipes. High-frequency welding is divided into contact welding and induction welding.

The main purpose
ERW straight seam welded pipes are mainly used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction in China. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: piling pipes, bridges; pipes for docks, roads, building structures, etc.

ERW straight seam welded pipe is generally used as wire casing in the electric power industry. Performance features: 100% ultrasonic testing of the base material ensures the inherent quality of the pipe body; there is no unwinding-disc shearing process, base metal pitting , less scratches; there is basically no residual stress in the finished pipe after stress relief; the welding seam is short, and the probability of defects is small; moist sour natural gas can be transported conditionally; after diameter expansion, the geometric size accuracy of the steel pipe is high; welding It is carried out in a straight line in a horizontal position after the molding is completed. Therefore, the staggered edges, seams, pipe diameter and circumference are well controlled, and the welding quality is excellent.