1.HG20-114 High Frequency Welded Pipe Machine; 2.Apply:produce round, square, rectangle pipe.its sizes ... 8mm up to 114mm. HG20-114 High Frequency Welded Pipe Machine High frequency welded pipe machine uses roll forming theory to coil long ... flying saw,straightener,end milling equipment,hydrostatic testing machine,charge table,sack&bale machine,high frequency DC drag,product line electric applicance. ...