Large diameter erw steel pipe is widely used in aviation, aerospace, energy, electronics, automotive, light industry High Frequency Welding and other industrial sectors, is one of the important welding process.

Large diameter erw steel pipe main processing methods are:
Forged steel: the use of forging hammer reciprocating impact force or the pressure of the press to change the blank into the shape and size we need a pressure processing method.

Extrusion: the steel will be placed in the closed steel extrusion Jane, one end of the pressure, so that the metal from the die out of the hole to be the same shape and size of the finished product processing methods for the production of non-ferrous metal products, steel.

Rolling: a method of machining a steel material by passing it through a gap (a variety of shapes) of a pair of rotary rolls, by reducing the cross-section of the material by compression of the rolls, and by increasing the length.

Drawing steel: is the rolling of the metal blank (type, pipe, products, etc.) through the die hole into the cross-section to reduce the length of the HF Welding Companies increase in processing methods are mostly used for cold work.