... welding it into tube blank quickly.After cooling,sizing and broad straightening,the needed pipe will be produced. ... Productive process:Raw material (steel coil) → un-coiler → shearing and butt-welding → material accumulating → non-power leveling →mill-forming ... butt welder,storing device,forming and sizing unit,flying saw,straightener,end milling equipment,hydrostatic testing machine,charge table,sack& ...