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Cobalt-chromium-tungsten alloy powder for valve spraying welding and welding technology thereof

A technology of cobalt-chromium-tungsten alloy and welding process, which is applied in the field of remanufacturing and processing, can solve the problems of resource waste, valve discarding, high cost, etc., achieve excellent corrosion resistance, realize remanufacturing, and improve performance

Inactive Publication Date: 2017-11-10
WUHU DINGHAN REMFR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the valve is used for a long time, some parts will be worn and cracked, which will affect the normal operation of the engine. Therefore, it needs to be repaired and replaced in time. This method is costly, and the disassembled valve will be discarded, resulting in waste of resources. Therefore, there is an urgent need for a method for valve remanufacturing

Method used

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  • Cobalt-chromium-tungsten alloy powder for valve spraying welding and welding technology thereof
  • Cobalt-chromium-tungsten alloy powder for valve spraying welding and welding technology thereof
  • Cobalt-chromium-tungsten alloy powder for valve spraying welding and welding technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Cobalt-chromium-tungsten alloy powder for valve spray welding, including the following components in mass percentage:

[0019]

[0020]

[0021] The high-carbon ferrochromium includes the following components in mass percentage: 72.0% of Cr, 2% of C, 1% of Si, 0.03% of P, 0.01% of S, and the balance of Fe. High carbon ferrochrome can improve the overall corrosion resistance.

[0022] The nickel-based tungsten carbide powder includes the following components in mass percentage: 60% of Ni60A and 40% of WC. Tungsten carbide nickel-based powder can greatly improve the wear resistance of the welding layer.

[0023] The nickel-chromium alloy powder includes the following components in mass percentage: 20% of Cr, 6% of Co, 5% of Al, 0.4% of Y, 0.4% of C, 1% of Fe, and the balance of Ni.

[0024] The welding process of cobalt-chromium-tungsten alloy powder for valve spray welding is as follows: the cobalt-chromium-tungsten alloy powder is spray-welded on the surface of ...

Embodiment 2

[0026] Cobalt-chromium-tungsten alloy powder for valve spray welding, including the following components in mass percentage:

[0027]

[0028] The high-carbon ferrochrome includes the following components in mass percentage: 62.0% of Cr, 6% of C, 3% of Si, 0.01% of P, 0.04% of S, and the balance of Fe. High carbon ferrochrome can improve the overall corrosion resistance.

[0029] The nickel-based tungsten carbide powder includes the following components in mass percentage: 60% of Ni60A and 40% of WC. Tungsten carbide nickel-based powder can greatly improve the wear resistance of the welding layer.

[0030] The nickel-chromium alloy powder includes the following components in mass percentage: 18% of Cr, 7% of Co, 3% of Al, 0.5% of Y, 0.1% of C, 0.1% of Fe, and the balance of Ni.

[0031] The welding process of cobalt-chromium-tungsten alloy powder for valve spray welding is as follows: the cobalt-chromium-tungsten alloy powder is spray-welded on the surface of the workpiec...

Embodiment 3

[0033] Cobalt-chromium-tungsten alloy powder for valve spray welding, including the following components in mass percentage:

[0034]

[0035] The high-carbon ferrochrome includes the following components in mass percentage: 70% of Cr, 4% of C, 2% of Si, 0.02% of P, 0.03% of S, and the balance of Fe. High carbon ferrochrome can improve the overall corrosion resistance.

[0036] The nickel-based tungsten carbide powder includes the following components in mass percentage: 60% of Ni60A and 40% of WC. Tungsten carbide nickel-based powder can greatly improve the wear resistance of the welding layer.

[0037] The nickel-chromium alloy powder includes the following components in mass percentage: 22% of Cr, 5% of Co, 6% of Al, 0.3% of Y, 0.5% of C, 1% of Fe, and the balance of Ni.

[0038] The welding process of cobalt-chromium-tungsten alloy powder for valve spray welding is as follows: the cobalt-chromium-tungsten alloy powder is spray-welded on the surface of the workpiece by...

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Abstract

The invention relates to cobalt-chromium-tungsten alloy powder for valve spraying welding and a welding technology thereof. The cobalt-chromium-tungsten alloy powder is prepared from, by mass, 0.9%-1.1% of activated carbon powder, 33%-36% of high carbon ferro-chrome, 0.2%-0.9% of silicon metal, 7%-8% of tungsten carbide nickel base powder, 1%-2% of water-mist-method iron powder, 2%-3% of electrolytic manganese powder, 0.1%-0.4% of nano-tantalum powder, 4%-5% of nickel-chromium alloy powder and the balance cobalt powder. The cobalt-chromium-tungsten alloy powder is face-centered cubic solid solution alloy, and is one alloy with the broadest application in an alloy series. The content of carbon and the content of tungsten are moderate, and the tenacity is good. In the wide temperature range of 850 DEG C or below, the cobalt-chromium-tungsten alloy powder has the excellent corrosion resistance, high-temperature resistance, impact resistance and adhesive wear resistance. After the cobalt-chromium-tungsten alloy powder is adopted and spray-welded on the surface of a valve, the size of the valve is repaired, the performance of the valve can be greatly improved, and reproducing of the valve is achieved.

Description

technical field [0001] The invention relates to the technical field of remanufacturing, in particular to cobalt-chromium-tungsten alloy powder for valve spray welding and its welding process. Background technique [0002] The function of the valve is to be responsible for inputting air into the engine and discharging the exhaust gas after combustion. From the structure of the engine, it is divided into intake valve and exhaust valve. The role of the intake valve is to draw air into the engine and mix it with fuel for combustion; the role of the exhaust valve is to discharge the burned exhaust gas and dissipate heat. The temperature of the valve head is very high, and it also bears the pressure of the gas, the force of the valve spring and the inertial force of the transmission assembly. Its lubrication and cooling conditions are poor, and the valve must have certain strength, stiffness, heat resistance and wear resistance. The intake valve is generally made of alloy steel,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/40
CPCB23K35/24B23K35/40
Inventor 程敬卿薛卫昌周乾坤
Owner WUHU DINGHAN REMFR TECH
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