Method for spray-welding anisotropic material on cast iron valve plate

Abstract

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.

Description

technical field [0001] The invention belongs to a valve processing technology, in particular to a method for spray-welding heterogeneous materials on the sealing surface of a cast iron valve plate. Background technique [0002] The valve plate of the valve is usually made of ductile iron. During the use of the valve, due to the poor wear resistance and corrosion resistance of the valve plate, the valve will appear leaking, dripping and leaking after a short period of use. For a long time, valve manufacturers have been trying to improve the wear resistance and corrosion resistance of valve plates, especially for valves used in the water treatment industry, where all parts in contact with the medium must not pollute the medium. The methods adopted at present are: the first method: use electric welding, this method cannot be implemented on the ductile iron valve plate by spray welding the stainless steel coating at all. Not only the base metal is cracked, but also the welding...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the deficiencies in the prior art and provide a method for spray-welding heterogeneous materials on the sealing surface of cast iron valve plate, adopting supersonic plasma spray-welding process, spray-welding corrosion-resistant on the sealing surface of nodular cast iron valve plate , wear-resistant stainless steel, which solves the problem of easy cracks, and also reduces energy consumption and production costs

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