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.

ERW is a general term for resistance welded steel pipes. Straight seam high-frequency resistance welding pipe (Electric Resistance Welding, referred to as ERW). ERW is the first letter of the corresponding English word. Resistance welded steel pipes are divided into two forms: AC welded steel pipes and DC welded steel pipes.

AC welding is divided into low frequency welding, medium frequency welding, super medium frequency welding and high frequency welding according to the frequency. 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. DC welding is generally used for small diameter steel pipes.

Therefore, in summary, high-frequency welded pipe is included in ERW welded pipe, which is a kind of ERW welded pipe produced by high-frequency welding process. ERW straight seam welded pipe is a steel pipe with advanced product performance, leading quality and relatively economical performance in the field of oil and gas storage and transportation.

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, and pipe diameter and circumference are well controlled, and the welding quality is excellent.

technical standard
The nominal diameter of the welded pipe is 6~150mm, and the nominal wall thickness is 2.0~6.0mm. The length of the welded pipe is usually 4~10 meters, and it can be shipped from the factory in fixed length or multiple lengths. The surface quality of steel pipes should be smooth, and defects such as folding, cracks, delamination, and lap welding are not allowed. The surface of the steel pipe is allowed to have minor defects such as scratches, scratches, weld dislocations, burns and scars that do not exceed the negative deviation of the wall thickness. Allowing thickening of wall thickness at welds and presence of internal weld bars

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.