The pipe making machine in 2004,has passed ISO9001:200 Quality Managing ... barrelled roll φ60mm,40Cr changing quality treatment,surface high frequence7) Vertical Rollφ35mm,40Cr changing quality treatment,surface ... uintDiameter of Wleded Tubes Φ22~Φ45mmWall Thickness of Welded Tube 0.6~2.75mmSpeed of Tube Welding 20 ... in the near future!! GH45 straight seam and high frequency welded pipe making machine