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Laser repair method for damaged blade of coal gas turbo expander
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A turbo expander and laser repair technology, which is applied in the coating process and coating of metal materials, can solve problems that affect work efficiency, are not suitable for sustainable development, and weaken performance, so as to improve work efficiency and reduce relapses. The effect of capital investment and service life extension
Active Publication Date: 2012-05-23
河北瑞兆激光再制造技术股份有限公司
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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.
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Embodiment 1
[0037] Before repairing: First of all, the moving and stationary blades of the gas turbine expander should be disassembled. Then remove dust, oil, rust, etc. on the blades. Detect the size of each part of the blade, and determine the damaged part and size of the blade. Remove 0.5mm of the fatigue layer at the damaged part of the blade. Detect the material of the base material of the blade, determine its hardness, and configure the metal alloy powder required for laser repair according to the detected results. According to the material and hardness of the blade, determine the composition of the powder and the content of each component is 47% Fe, 40% Ni, 11% Cr, 1.8% Mn.
[0038] During the repair process: first debug the laser, adjust the operating data of the laser, and set the technical parameters of laser cladding as follows: laser power 1900W, spot diameter 5mm, scanning speed 800mm / min, lap 2mm. Laser cladding is then performed on the damaged part of the blade.
[0039...
Embodiment 2
[0041] Before repairing: First of all, the moving and stationary blades of the gas turbine expander should be disassembled. Then remove dust, oil, rust, etc. on the blades. Detect the size of each part of the blade, and determine the damaged part and size of the blade. Remove 1mm of the fatigue layer at the damaged part of the blade. Detect the material of the blade base material to determine its hardness. According to the detected results, the metal alloy required for laser repair is configured. According to the material and hardness of the blade, the powder composition and the content of each composition are determined to be 47% Fe, 40.5% Ni, 10% Cr, and 1.5% Mn.
[0042] In the repair process: first debug the laser, adjust the operation data of the laser, and set the technical parameters of laser cladding as follows: laser power 2200W, spot diameter 5mm, scanning speed 800mm / min, lap 1mm; Laser cladding is performed on the damaged part of the blade.
[0043] After the r...
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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 bladeand 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 blade repair method in the mechanical processing field, in particular to a laser repair method for damaged blades of a gas turbine expander. Background technique [0002] Before the advent of laser repair technology, if the blades in the gas turbine expander had failures such as missing corners or curling, they were generally repaired by traditional electric welding. 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 environmental protection and economic point of view, and it is not suitable for the requirements of sustainable development, which not only causes huge capital investment again, but also...
Claims
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Application Information
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