ERW steel pipe is a kind of resistance welding steel pipe, high-frequency resistance welding (Electric Resistance Welding, abbreviation For ERW) ERW is the first letter of the corresponding English word. Resistance welding steel pipe is divided into two forms of AC welding steel pipe and DC welding steel pipe.
AC welding is divided into low-frequency welding, medium-frequency welding, ultra medium-frequency welding and high-frequency welding according to the frequency. High frequency welding is mainly used for thin-walled steel pipe.
Still the production of ordinary wall thickness, high-frequency welding is divided into contact welding and induction welding.
Small diameter steel pipe is generally used for DC welding.
Therefore, generally speaking, high-frequency welded pipes are included in ERW pipes, which are produced by high-frequency welding process.ERW straight seam welded pipe (ERW) is the most advanced and economical steel pipe in the field of oil and gas storage and transportation.
The following diagram shows the manufacturing process of LSAW pipe
