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Alloy laser-cladding method for surface of helical casing in screw pump

A technology of laser cladding and spiral sleeve, which is applied in the field of laser cladding, can solve the problems of performance degradation, decrease of screw pump flow rate and output pressure, increase of failure rate, etc., to achieve improved service life, increased dislocation density, uniform and dense structure Effect

Inactive Publication Date: 2012-05-23
天津市汇利通金属表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During use, due to the corrosion of chemical substances such as sulfide in crude oil and the wear of impurities such as sediment in heavy oil, the surface of the screw sleeve is easily damaged, which will increase the gap between the screw sleeve and the pump body. As a result, the flow rate and output pressure of the screw pump are reduced, the performance is reduced, and even scrapped, which increases the failure rate and affects its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The surface laser cladding alloy method for the spiral sleeve in the screw pump provided in this embodiment includes the following steps performed in sequence:

[0018] 1) Remove 1.0mm from the surface thickness of the formed spiral sleeve by turning or grinding, and the material of the spiral sleeve is 1Cr18Ni9Ti;

[0019] 2) The alloy powder composed of 85% nickel-based alloy and 15% spheroidized tungsten carbide is clad on the above-mentioned removed surface layer with a laser under the conditions of a spot diameter of 5.0mm, an overlap of 1.5mm and a line speed of 600mm / min The surface of the spiral sleeve is protected by 99.9% argon gas during the cladding process to avoid burning and decomposition of tungsten carbide, and then a layer of alloy cladding layer is formed by rapid cooling through the self-cooling of the substrate at room temperature; The thickness of the coating is 1.3. During laser cladding, a laser is used to scan the alloy powder on the surface of...

Embodiment 2

[0022] The surface laser cladding alloy method for the spiral sleeve in the screw pump provided in this embodiment includes the following steps performed in sequence:

[0023] 1) Remove 1.0mm from the surface thickness of the formed spiral sleeve by turning or grinding, and the material of the spiral sleeve is 1Cr13;

[0024] 2) The alloy powder composed of 85% nickel-based alloy and 15% spheroidized tungsten carbide is clad on the above-mentioned removed surface layer with a laser under the conditions of a spot diameter of 5.0mm, an overlap of 1.5mm and a line speed of 500mm / min The surface of the spiral sleeve is protected by 99.9% argon gas during the cladding process to avoid burning and decomposition of tungsten carbide, and then a layer of alloy cladding layer is formed by rapid cooling through the self-cooling of the substrate at room temperature; The thickness of the cladding is 1.1.

[0025] 3) The surface layer of the alloy cladding layer is removed by 0.5 mm by tur...

Embodiment 3

[0027] The surface laser cladding alloy method for the spiral sleeve in the screw pump provided in this embodiment includes the following steps performed in sequence:

[0028] 1) Remove 1.0mm from the surface thickness of the formed spiral sleeve by turning or grinding, and the material of the spiral sleeve is 1Cr13;

[0029] 2) The alloy powder composed of 80% nickel-based alloy and 20% spheroidized tungsten carbide is clad on the above-mentioned removed surface layer with a laser under the conditions of 5.0mm spot diameter, 1.5mm overlap and 700mm / min line speed The surface of the spiral sleeve is protected by 99.9% argon gas during the cladding process to avoid burning and decomposition of tungsten carbide, and then a layer of alloy cladding layer is formed by rapid cooling through the self-cooling of the substrate at room temperature; The thickness of the coating is 1.0.

[0030] 3) The surface layer of the alloy cladding layer is removed by 0.5 mm by turning or grinding ...

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Abstract

The invention discloses an alloy laser-cladding method for the surface of a helical casing in a screw pump. In the method, high temperature-resistant, corrosion-resistant and abrasion-resistant alloy powder is cladded on the surface of a helical casing by using the laser technology, thus forming an alloy cladding layer. The alloy powder contains elements or oxides thereof which are capable of refining, intensifying and having other effects on crystal grains of the alloy cladding layer, so the structural characteristics of the alloy cladding layer appears as refining of the crystal grains, increase of the dislocation density and uniform and compact structure, and the alloy cladding layer also has the effects on solution strengthening of the supersaturated alloy, and dispersion strengthening of superfine compounds and the like. Thus, the rigidity, wear resistance, corrosion resistance, fatigue resistance and other mechanical properties of the surface of the helical casing can be effectively improved, thereby greatly prolonging the service life of the screw pump. In addition, the method can be also used for repairing the surface of a faulted helical casing, thereby effectively lowering the production cost.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, and in particular relates to a method for laser cladding alloy on the surface of a screw sleeve in a screw pump. Background technique [0002] The screw pump is a positive displacement pump that uses the rotation of the screw to suck and discharge liquid. It mainly includes a pump body, a helical sleeve installed inside the pump body and at least one screw. According to the number of screws, it is divided into single screw pump, twin screw pump and Three-screw pump, etc. The currently commonly used screw pumps have the following problems: In the petrochemical industry, screw pumps are mainly used to transport viscous liquids such as lubricating oil, fuel oil and high molecular polymers. During use, due to the corrosion of chemical substances such as sulfide in crude oil and the wear of impurities such as sediment in heavy oil, the surface of the screw sleeve is easily damaged, which will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 郎娟刘耀龙苏健全
Owner 天津市汇利通金属表面技术有限公司