DVS 0912-2:1991-02 Gas metal-arc welding of steel; guideline for the implementation of the procedure; prevention of pore formation
DVS 1155:1984-12 DVS training course; gas-shielded tungsten arc welder
DVS 1156:1984-12 DVS training course; gas-shielded metal arc welder
DVS 1152:1984-12 DVS course; instructor for arc welding