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

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 ...

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 and verification: the laser cladding process is used to complete the wear-resistant and anti-corrosion coating on the top cover of the water turbine unit. There is no precedent in China, and there are no related reports abroad.