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Restoring method of last-stage blade of steam turbine

A technology of the final blade and repair method, which is applied in the direction of coating, metal material coating process, etc., to achieve the effect of small heat source, high energy density and small deformation

Active Publication Date: 2011-04-27
SHENYANG DALU LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for other specific equipment components, especially key components such as the last stage blade of a steam turbine, whether the conventional laser cladding molding process can be used to repair without cracks and pore defects and homogeneously, has been searched and verified by the applicant: There is no precedent in China, and there are no relevant reports abroad. Finding an appropriate method of repairing the last stage blade of a steam turbine by laser cladding still requires further creative research work by technical personnel in the field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Repair of last-stage blades of medium-pressure rotor of a 200,000 kw steam turbine

[0050] Steam turbine final stage blade material: 1Cr13

[0051] After the laser processing system and finalized tooling are installed, compile the laser cladding program, at the same time clamp and polish the damaged area of ​​the final blade, perform flaw detection, start the laser and powder feeder, and carry out cladding, first cladding the bottom layer, C: 0.4 ~0.9%; Cr: 24~30%; W: 6~10%; Ni: 8~14%; Mn: 0.3~0.8%; Si: 0.5~1.0%; Zr: 0.02~0.06%; 0.5%; Co: balance.

[0052] The process parameters of laser profile cladding are as follows

[0053] Power: 500W; Spot diameter: 2.5mm; Powder thickness: 0.4mm; Scanning speed: 18mm / s Overlap rate: 50%

[0054] After the cladding of the bottom layer, the cladding area of ​​the surface layer is formed by clamping and grinding, and the cladding area of ​​the surface layer is carried out.

[0055] The rotor worked fine after repair.

Embodiment 2

[0057] Material of last stage blade of low pressure rotor of a 100,000 kw steam turbine: 2Cr13

[0058] Laser profiling cladding power: 1200W; spot diameter: 2mm; powder thickness 0.5mm; cladding material composition: C: 0.4~0.9%; Cr: 24~30%; W: 6~10%; Ni: 8~ 14%; Mn: 0.3-0.8%; Si: 0.5-1.0%; Zr: 0.02-0.06%; Hf: 0.25-0.5%; Co: margin; scanning speed: 15mm / s, lap rate: 60%; Cladding thickness: according to the damage situation, the size after cladding is required to be about 2mm higher than the undamaged base height.

[0059] The rotor worked fine after the repair.

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Abstract

The invention relates to a restoring method of a last-stage blade of a steam turbine, which is characterized by comprising the following steps of: 1, detecting the last-stage blade of the steam turbine before restoring; 2, manufacturing a shape line sample plate of the last-stage blade of the steam turbine; 3, cleaning a fatigue layer of the last-stage blade of the steam turbine; 4, copying and cladding injured parts by lasers; 5, modifying by pliers; and 6, detecting after restoring. In the invention, the restored last-stage blade of the steam turbine does not need heat treatment and heat calibration, the blade is modified by only using the shape line template after cladding, and therefore, the last-stage blade of steam turbine has complete shape lines and higher service life at the same time.

Description

Technical field: [0001] The invention relates to a method for repairing the last-stage blade of a steam turbine, in particular to a method for repairing the last-stage blade of a steam turbine by laser cladding, and belongs to the technical field of C23C24 / 10 (2006.01) I in the IPC International Patent Classification Table. Background technique: [0002] The last blade of the steam turbine is the last blade of the steam turbine unit in the power plant, and it is the longest and the heaviest group. The working medium of the steam turbine is water vapor. When the airflow flows to the final blade, the water vapor already contains a certain amount of liquid water droplets, and these water droplets will rotate at a high speed (the size of the steam turbine is different, and the number of revolutions is 1500rpm, 3000rpm, etc.) Several grades) of the final stage blades cause scour, which greatly affects the strength, balance state, working efficiency and life of the steam turbine f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07C22C30/00
Inventor 张静波陈江
Owner SHENYANG DALU LASER TECH
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