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Restoring method of last-stage blade of steam turbine

The technology of last stage blade and repair method is applied in the field of repairing the last stage blade of steam turbine by means of laser cladding, and achieves the effects of small heat source, small heat radiation area and high energy density

Active Publication Date: 2012-07-11
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 the last stage blades of the medium pressure rotor of a 200,000kw steam turbine

[0050] Material of final stage blade of steam turbine: 1Cr13

[0051] After the laser processing system and the finalizing tooling are installed, the laser cladding program is compiled, and the damaged area of ​​the final blade is repaired and polished at the same time, the flaw detection is performed, the laser and the powder feeder are activated, and the cladding is performed. The bottom layer is first cladding, 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.

[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 bottom layer is cladding, the pliers are polished to shape and the cladding area of ​​the surface layer is ground, and the surface layer is cladding. After the cl...

Embodiment 2

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

[0058] Laser profile 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, overlap rate: 60%; Cladding thickness: According to the damage, the size after cladding is required to be about 2mm higher than the undamaged base height.

[0059] The rotor is running well after 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 sametime.

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 means of 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-stage blade of a steam turbine is the last-stage blade of a steam turbine unit in a power plant. It is the group with the longest length and the heaviest weight. The working medium of the steam turbine is water vapor. When the airflow reaches the final stage blades, the water vapor already contains a certain amount of liquid droplets. These droplets will rotate at a high speed (the size of the steam turbine unit is different, the number of rotations is 1500rpm, 3000rpm, etc. The last stage blades of several grades cause scouring, which greatly affects the strength, balance, working efficiency and life of the las...

Claims

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Application Information

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