ERW pipe - high frequency straight seam welded pipe - frequently straight seaming welded pipe (ERW pipe) is a hot-rolled coil which formed through the molding machine, the use of high-frequency current skin effect and proximity effect, so that the edge of heating and melting tube , in the role of squeeze rollers welded under pressure to achieve production.
High-frequency resistance welding method used in pipe production started 50 years ago. First, ERW pipe used in the production of quality raw materials have significantly changed the design of steel components, low C, low P, S, micro-alloying; smelting process BOF, ladle refining, vacuum degassing, continuous casting and the use of technology. ERW pipe rolling controlled rolling, and cooling technology enables large and medium caliber ERW steel pipe, Hot dipped galvanized pipe, with the appearance of size, appearance quality, physical and chemical performance greatly.
Followed by large and medium caliber, ERW pipe form and heat treatment processes to achieve the production process computer control, high frequency welding process. Heat with the computer's automatic compensation system has been effectively controlled. In order to prevent the welding, heat input of low energy caused by cold welding, Weld and heat caused by higher input energy than burning. In recent years, countries are actively using substitute Seamless ERW pipe and spiral welded pipe in the industrial department.
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