Laser cladding process of wear-resistant and corrosion-resistant coating of top cover of hydraulic turbine set

A technology of laser cladding and anti-corrosion coating, which is applied in the field of wear resistance and anti-corrosion. It can solve the problems of not being able to adapt and not seeing it, and achieve improved wear-resistant and anti-corrosion performance and service life, firm metallurgical bonding, and uniform coating. Effect

Inactive Publication Date: 2011-03-30
SHENYANG DALU LASER COMPLETE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for other specific equipment components, such as special structures such as the top cover of hydraulic turbines, the existing laser cladding process is obviously unable to adapt
[0013] According to the applicant's search

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0039] (1) Surface pretreatment of the top cover of the turbine unit

[0040] Use high-strength nickel-based welding wire to weld a circle of 45° oblique angle process ring at the right angle between the inner ring surface of the leak-proof ring of the top cover and the wear-resistant plane; Oil, rust, and clean with alcohol. And label the processing area partitions. Use the coloring flaw detection method to inspect the anti-wear plate on the inner ring surface of the leak-proof ring of the top cover and the processed parts of the flat anti-wear plate. It is required that the processed parts have no defects such as cracks, pores, inclusions, etc.;

[0041] (2) Selection of alloy powder and adjustment of automatic powder feeding device

[0042] The iron-based alloy powder with excellent wear resistance and corrosion resistance and good metallurgical compatibility with the matrix is ​​selected. The chemical composition of the iron-based alloy powder is: C: 0.8%, Cr: 16%, Ni: 3...

Embodiment example 2

[0058] (1) Surface pretreatment of the top cover of the turbine unit

[0059] Use high-strength nickel-based welding wire to weld a circle of 45° oblique angle process ring at the right angle between the inner ring surface of the leak-proof ring of the top cover and the wear-resistant plane; Oil, rust, and clean with alcohol. And label the processing area partitions. Use the coloring flaw detection method to inspect the anti-wear plate on the inner ring surface of the leak-proof ring of the top cover and the processed parts of the flat anti-wear plate. It is required that the processed parts have no defects such as cracks, pores, inclusions, etc.;

[0060] (2) Selection of alloy powder and adjustment of automatic powder feeding device

[0061] The iron-based alloy powder with excellent wear resistance and corrosion resistance and good metallurgical compatibility with the matrix is ​​selected. The chemical composition of the iron-based alloy powder is: C: 0.8%, Cr: 16%, Ni: 3...

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PUM

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Abstract

The invention provides a laser cladding process of a wear-resistant and corrosion-resistant coating of a top cover of a hydraulic turbine set, which is characterized by comprising the following steps: firstly welding a bevel process ring through nickel-base welding wires at a right angle position on which an inner ring surface and a wear-resistant plane of an anti-leakage ring of the top cover are crossed, deoiling and derusting machining surfaces, labeling machining areas, and inspecting machining positions by a dye penetrant inspection method; selecting Fe-based alloy powder, employing laser equipment and adjusting an automatic power feeder so that the alloy powder from an automatic power feed head falls into a laser molten pool, and adjusting powder feeding quantity so that the thickness of the alloy powder coating reaches 0.2-1.8mm; and inspecting whether the machining positions of a wear-resistant plate on the inner ring surface and a wear-resistant plate on the plane of the anti-leakage ring of the top cover have defects such as cracks, air holes and the like by the dye penetrant inspection method. The alloy coating obtained by laser cladding is uniform and compact, can form firm metallurgical bonding with a matrix, has excellent wear resistance and corrosion resistance, and can obviously improve the wear resistance, the corrosion resistance and the service life of the top cover of the hydraulic turbine set.

Description

technical field [0001] The invention relates to a wear-resistant and anti-corrosion method for power generation equipment components, in particular to a process for preparing a wear-resistant and anti-corrosion coating on the top cover of a water turbine unit using laser cladding technology, which belongs to C23C24 / in the IPC International Patent Classification Table 10 (2006.01) I Technical field. Background technique [0002] The top cover of the hydraulic turbine is a key component in the equipment of the hydraulic turbine. The wear and tear of the flow parts of the turbine has always been an intractable disease in the operation of hydropower stations. Especially with the intensification of environmental damage and the increase of sediment content, the wear and damage of the top cover of the turbine tends to intensify. Due to this wear and tear, the shape and surface of the flow-passing parts of the turbine have changed, thereby destroying the flow conditions that the ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 陶兴启黄旭东廖运生
Owner SHENYANG DALU LASER COMPLETE EQUIP
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