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

A technology of heterogeneous materials and sealing surfaces, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as cracks easily, achieve the effects of increasing adhesion, reducing production costs, and simple spray welding process

Active Publication Date: 2010-07-28
TIANJIN FSK FLOW CONTROL EQUIP
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  • Abstract
  • Description
  • Claims
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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

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

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[0008] Below in conjunction with the preferred embodiments, the specific implementation methods provided according to the present invention are described in detail as follows: see the accompanying drawings for details, a method for spray-welding heterogeneous materials on the sealing surface of a cast iron valve plate, the specific process steps are as follows: 1. Valve plate Sorting and checking whether there is oil stain on the spray welding position and the valve plate within 20mm of the adjacent two sides, and place the valve plate with oil stain and the valve plate without oil stain respectively; 2. The sealing surface of the valve plate is polished. The grinding machine grinds off the sharp edges on both sides of the valve plate sealing surface and the sharp edges at the shaft hole orifice to make the sealing plate surface arc transition; 2. Soak the valve plate with synthetic water-based anti-rust cleaning agent After 30 minutes, wash it with clean water and dry it in th...

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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...

Claims

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Application Information

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IPC IPC(8): B23K9/04
Inventor 范全军王先文
Owner TIANJIN FSK FLOW CONTROL EQUIP
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