... up to 114mm. HG20-114 High Frequency Welded Pipe Machine High frequency welded pipe machine uses roll forming theory to coil ... and broad straightening,the needed pipe will be produced.Productive process:Raw material (steel coil) → un-coiler → shearing ... ,straightener,end milling equipment,hydrostatic testing machine,charge table,sack&bale machine,high frequency DC drag,product line electric applicance ...