The invention relates to a method for spray-
welding anisotropic material on a
cast iron valve plate. The specific technique includes the steps of: valve plate selecting, valve plate sealing surface
polishing, sanding and coursing, adopting special valve plate sealing surface spray-
welding device to spray weld the valve plate sealing surface, adjusting the current of a wire feeder to 200A-400A and the
voltage to 10V-40V to maintain the wire-feeding speed at 3-8m / min, obtaining the
supersonic speed particle radiation under the working conditions that the gas flow is adjusted to be 3-6 square meters per hour and the power is adjusted to be 50-80kw, opening the spray gun opening for spray-
welding, ensuring the welding wire from the spray gun to form beam-shaped
flame, sending two electriferous welding wires to the spray gun, generating
electric arc at the contact tips of the two welding wires to form molten drops, spraying the melt molten drops through
compressed air onto the surface of working piece to form a
coating layer,and detecting. The invention has the beneficial effects that the spray-
welding process is simple; the heating before welding and the
heat processing after welding are not needed for the valve plate; the stainless steel spray-welding layer is firmly combined with the valve plate main body, the valve plate is prevented from
crackles; thereby the purposes of increasing the wearing resistance and the
corrosion resistance of the valve plate are achieved.