Laser repair method for damaged blade of coal gas turbo expander

Abstract

The invention relates to a laser repairing method for a damaged blade of a coal gas turbo expander. The method comprises the following steps: dismounting a movable blade and a stationary blade and cleaning; measuring sizes of various parts of the movable blade and the stationary blade, determining the damaged part of the blade and the size thereof, carrying out laser repairing on the damaged part, and removing the fatigue layer with the thickness of 0.5-1 mm at the damaged part of the blade; measuring the hardness and detecting the material of the base metal of the blade, and configuring metal alloy powder according to the detecting results; adjusting the operation data of a laser, and setting laser cladding technical parameters; carrying out laser cladding on the damaged part; polishing and processing the damaged part; determining the shape and size of the blade, and polishing the surface of the blade; performing dyepenetrant inspection on the surface of the blade; weighing the movable blade; performing heat treatment on the movable blade and the stationary blade; performing nondestructive inspection on the movable blade and the stationary blade; and re-assembly the movable blade and the stationary blade, and performing dynamic balance on a rotor. In the laser repairing method provided by the invention, the problem that the mechanical properties can not meet the using requirements after the repairing with the conventional process is solved, the service life of the blade is prolonged, the reinvestment of enterprises is reduced, and operating efficiency is improved.

Description

Technical field [0001] The invention relates to a repairing method for blades in the field of mechanical processing, in particular to a laser repairing method for damaged blades of a gas turbine expander. Background technique [0002] Before the emergence of laser repair technology, if the blades of gas turbine expanders have broken corners or curled edges, they will generally be repaired by traditional electric welding. The problem with this repair technology is that the repaired parts tend to be relatively weaker than the original before repair. If the repair effect is not satisfactory, the company will generally replace the new blade directly. With the development of the industry, the lack of natural resources is serious. From the perspective of environmental protection and economics, it is obviously unfavorable to replace new blades, and it is not suitable for the requirements of sustainable development. This not only causes huge capital investment again, but also seriously a...

AI Technical Summary

Problems solved by technology

The problem with this repair technology is that the parts after repair are often relatively weaker than the original parts before repair. If the repair effect is not satisfactory, companies generally replace new blades directly. With the development of industry, the shortage of natural resources is serious. It is obviously unfavorable to require replacement of new blades from the perspective of environmental protection and economy, and it is not suitable for the requirements of sustainable development. This not only causes huge investment of funds again, but also seriously affects work efficiency.