Process for laser cladding for abrasion-resistant and etch-resistant coating of water turbine set bottom ring

Abstract

The invention relates to a method for laser cladding for an abrasion-resistant and etch-resistant coating of a water turbine set bottom ring. The method is characterized by comprising the following steps of: welding an oblique angled process ring at a right angle where the inner ring surface of a leak-preventing ring of the bottom ring is jointed with an abrasion-resistant plane by using a nickel-based welding wire; removing oil and rust from a machined surface; marking subareas of a machined area; inspecting the machined places of an abrasion-resistant plate of the inner ring surface of the leak-preventing ring of the bottom ring and a plane abrasion-resistant plate by a dye penetrant inspection method; selecting iron-based alloy powder; making the alloy powder out from an automatic powder feeding head drop into a laser weld pool by using laser equipment and adjusting an automatic powder feeding device; regulating the powder feeding amount to make the thickness of an alloy powder coating between 0.2 and 1.8mm; and inspecting the machined places of the abrasion-resistant plate of the inner ring surface of the leak-preventing ring of the bottom ring and the plane abrasion-resistant plate by the dye penetrant inspection method. The laser cladding alloy coating is uniform and compact, has firm metallurgical bonding with a substrate and has high abrasion resistance and etch resistance.

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 for the bottom ring 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 bottom ring 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 bottom ring 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 ...

AI Technical Summary

Problems solved by technology

However, for other specific equipment components, such as special structures such as the bottom ring of hydraulic turbines, the existing laser cladding process is obviously unable to adapt

[0013] According to the applicant's search and verification: there is no domestic precedent for the use of laser cladding technology to complete the wear-resistant and anti-corrosion coating of the bottom ring of the water turbine unit, and no relevant reports have been seen abroad