ERW steel pipe is a kind of resistance welded steel pipe, high frequency resistance welding (Electric Resistance Welding, abbreviation For ERW) ERW is the corresponding English word first letter. Resistance welded steel pipe is divided into AC welded steel pipe and DC welded steel pipe twoforms.
AC welding in accordance with the frequency is divided into low frequency welding, intermediate frequency welding, ultra-IF welding and high frequency welding. High-frequency welding is mainly used for thin-walled steel pipe.
Or ordinary wall thickness of the production, high frequency welding is divided into contact welding and induction welding.
DC welding is generally used for small diameter steel pipe.
Therefore, in general, high-frequency welded pipe is included in the ERW pipe, is a high-frequency welding process to produce an ERW pipe. ERW Longitudinal Welded Pipes (ERW) are the most advanced and economical steel pipes in the field of oil and gas storage and transportation.
The following picture is longitudinal welded pipe manufacturing flow chart
