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