The square or rectangular shaping is formed out before the tube welding, with important advantages in terms of power and material cost reduction. Features: 1) Compare with round into square & rectangle forming way, this way is better for the shape at the edge ...

The main difference between the two welded pipes of spiral welded pipe and straight welded pipe is the difference in welding form. Spiral welded pipe is a low carbon carbon structural steel or a low alloy structural steel strip rolled into a tube blank with a ...

High frequency straight seam welded pipe (ERW) is the hot rolled coil plate formed by the forming machine, using the skin effect and proximity effect of high frequency current to heat and melt the edge of the tube blank, and pressure welding under the action o...