What is the difference between erw and efw pipe

The two digit number following the "X" indicates the Minimum Yield Strength in 's psi of pipe produced to this grade. If you have questions, comments or feedback, please feel free to contact us. We are ready to help! Petrosadid Group. Go to. Global English. Piping Pipe tube Erw efw. Electric resistance welding ERW refers to a group of welding processes such as spot and seam welding that produce coalescence of faying surfaces where heat to form the weld is generated by the electrical resistance of material combined with the time and the force used to hold the materials together during welding Electric Fusion Welding EFW steel pipe refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld.

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High-quality steel pipe welds require online or off-line heat treatment, welding zone structure refinement, quality ERW pipe welds and base metal can reach the same level of toughness, which is submerged arc welding process can not be achieved.

EFW namely electric fusion welding of the first letter abbreviation. The skin effect and proximity effect of high frequency current are applied to the edge of instantaneous heating plate.

At the welding temperature, the welding seam of forging structure is extruded by extrusion roller. In order to improve the microstructure of the welding zone, heat treatment should be carried out on the welding line or off-line. The weld of high quality ERW pipe can reach the same toughness level as the base metal, which can not be achieved by submerged arc welding process. The welding method of ERW welded pipe is obviously different from that of submerged arc welded pipe. The unfilled metal is used for pressure welding, and other components are not filled in the weld.

The skin effect and proximity effect of high-frequency current make the instantaneous plate edge heated to the welding temperature, which is extruded by the extrusion roller to form the weld.