Tubing and Pipes

Electric Resistance Welded (ERW) Products – Square, Rectangular, Round and Oval Tubes. ERW is a process where electrical contacts or induction coils are used to manufacture the pipe. Steel strip is uncoiled, leveled and crop-sheared. It is then trimmed on both sides at the same time to correct width and immediately fed into the forming and welding line. This strip is fed into a series of cold forming rolls, where it is formed into a tubular shape, and then joined by high frequency electric resistance welding. The resulting product has a uniform wall thickness, and the welded area is heat-treated by post annealing to ensure adequate ductility at the weld.