How erw pipe sheer the evaluation of steel

Although SPT is traditionally more expensive than ERW pipe, similar technology to improve the ERW pipe and technology is now represents about 48% of the shipments of OCTG tonnage. The pipeline is through this process as electrical resistance welded (ERW known). Are close, but under what conditions, both carbon and economic unsatisfactory. ERW - Pipe bands from hot-rolled steel are passed through forming rolls and welded.

Hot dipped galvanized pipe with the second conference of the rotating disk of copper transformer. ERW - Electric Resistance Welded is also called, the appropriate thickness and width of the diameter of the pipe is to be prepared. Copper disk electrode contact with the temperature in the seam of each side, was promoted to the welding area. Removing from external flash tube electrode to leave as a tool for the abolition of the internal flash of a pneumatic hammer or a punch of the adoption of welded tubes was cooled tubes.It is then for a furnace when the temperature is suitable welding process was developed jointly, has forced the galvanized steel pipe with a matrix-shaped funnel-shaped, plaque is formed gradually fulfill pipe and the board with the merger.

Band in a series of forming rolls, the horizontal and vertical rollers so gradually from the flat strip into a tube, then may set includes the welding electrode suitable introduced. It was found that the tendency of carbon and molybdenum, and pointed out that the temperature of the graphite.