Direct application of a radiation-curable primer welding on zinc or galvanized steel

A method of applying a radiation-curable, electrically conductive coating composition to metal surfaces of zinc, galvanized steel or alloy-galvanized steel, wherein applying an electrically conductive and weldable coating agent in such a thickness on the metal surfaces without prior anti-corrosion treatment, that after radiation-induced curing, a layer thickness in the range from 1 to 10 microns yields, and cured by exposure to radiation, wherein the coating agent contains at least one organic binder and at least one conductive pigment having a density of up to 3 g / cm