... up to 114mm. HG20-114 High Frequency Welded Pipe Machine High frequency welded pipe machine uses roll ... → material accumulating → non-power leveling →mill-forming → high-frequency welding → removing burrs outside of weld seam → cooling ... welder,storing device,forming and sizing unit,flying saw,straightener,end milling equipment,hydrostatic testing machine,charge table,sack&bale machine,high frequency ...