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The electric resistance welding (ERW) , ERW is the first letter Refrigerant charging pipe corresponding to English words. High-frequency welding is divided into contact welding and induction welding. DC welding is generally used for small diameter steel pipes. ERW straight seam welded pipes are divided into low frequency welding, medium frequency welding, super intermediate frequency welding and high frequency welding according to the frequency. Resistance welded steel pipes are divided into two types: AC welded steel pipe and DC welded steel pipe.AC welding is divided into low frequency welding, medium frequency welding, super intermediate 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 wall-thickness steel pipes.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 pipe is a steel pipe with advanced performance, leading quality and economy in the field of oil and gas storage and transportation. High-frequency welding is divided into contact welding and induction welding.ERW straight seam welded pipe is generally used for wire casing in the China Ball valve Manufacturers power industry.Therefore, in general, the high-frequency welded pipe is included in the ERW welded pipe, and is an ERW welded pipe produced by a high-frequency welding process.ERW is a general term for electric resistance welded steel pipes. . High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary wall-thickness steel pipes. Performance characteristics: 100% ultrasonic inspection of the base metal to ensure the inner quality of the pipe body; no unwinding – disc shearing process, base metal puddle Less scratches; there is basically no residual stress in the finished pipe after stress elimination; the weld bead is short, the probability of defects is small; the wet acid natural gas can be transported conditionally; the geometrical accuracy of the steel pipe is high after the expansion; Is after the molding is completed, along the horizontal position straight line, therefore, wrong edge, slit, pipe diameter circumference control is good, welding quality is excellent

Tags: China Ball valve Manufacturers