DVS 2909-3-1994 Friction welding quality assurance of metallic materials and friction welding practice feature set has been changed from DVS 2909-4-1983 Friction welding of metallic materials; collection of characteristics from friction welding practice.
DVS 2909-3-1994 Friction welding quality assurance of metallic materials and friction welding practice feature set has been changed from DVS 2909-5-1984 Friction welding with metallic materials; quality assurance and list of concepts including explanations.