ASTM A53 Gr.B ASME B36.19 ERW Pipe

Erw Pipe Manufacturers-GNEE

ERW welded steel pipe is widely used in the oil and gas industry and is manufactured to ASTM standards (ANSI). Flat steel coils or rolls are fed to the forming section, which transforms the flat steel strip into round pipe sections. A high-frequency welder heats the strip edges to a melting point of 2600°F. Pressure rollers then squeeze the heated edges together to form a fusion weld. Resistance welded pipe production process is simple, high production efficiency, more varieties and specifications, less investment in equipment, but the general strength is lower than seamless steel pipe.

Resistance welding pipe is used without filler metal pressure welding, weld is not filled with other components, relying on high-frequency current skin effect and proximity effect, so that the edge of the plate is instantly heated to the welding temperature, by the extrusion rollers extrusion to form a forging organization of the weld.
Electrofusion welding pipe is through one or several self-consumption electrode and the workpiece between the metal heating between the metal in the combination of a process, the arc so that the metal and filler material fully melted, do not need to be pressurized, the filler metal part of the diligence of all from the electrode. This process is similar to submerged arc welding, but its protection is from the inert gas, the effect will be better.

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