2006DVS 2212-1-2006 "Qualification testing of plastics welders - Qualification test groups I and II - Hot gas welding with the torch separate from the filler rod (WF), high-speed hot gas welding (WZ), heated toolbutt welding (HS), sleeve welding with an incorporated electric
2005DVS 2212-1-2005 Plastic Welding Machine Test Test Group I and II
1992DVS 2212-2-1992 Examination of plastic welders - Examination group II - Hot gas extrusion welding
1991DVS 2212-2-1991 Plastic Welder Test; Test Group II; Hot Gas Extrusion Welding