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Electric power generator, steam turbine rotor spindle repaired by laser and repairing method thereof

A steam turbine rotor, laser repair technology, applied in the direction of machine/engine, liquid fuel engine, mechanical equipment, etc., can solve the problems of reduced service life, low surface hardness, etc., to achieve good lasting strength, good wettability, good lasting strength. Effect

Inactive Publication Date: 2005-09-28
SHENYANG DALU LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, copper plating is used for brush plating, which has good bonding strength, but the surface hardness is low, and the worn parts continue to wear after brush plating, so the service life is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Low-pressure rotor shaft of 200MW steam turbine

[0030] The rotor weight is about 20 tons, the length is 6m, the maximum turning diameter (last stage blade) is 2.4m, the rotor shaft material is 25Cr2Ni4MoV, the main journal diameter is φ300mm, the damage width is 250mm, and the maximum damage depth is more than 1mm. The fatigue layer is removed by mechanical processing; the alloy powder with the weight percentage content: Cr20, Mo4, W3.5, the balance Ni and the alloy powder with the weight percentage: Cr20, W4, C0.5, and the balance Co are respectively laser cladding Repair, the process parameters of laser cladding are: laser power 1500W, spot diameter φ4mm, spot moving speed 10mm / s; then machine plus complex, the experience is accepted as qualified. After various tests, its hardness index reaches HB240~260, which is required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-destructive testing. The resul...

Embodiment 2

[0031] Example 2 300MW generator rotor shaft

[0032] The rotor weight is about 40 tons, the length is 7m, the rotor shaft material is 30CrNiMo, the main journal diameter is φ450mm, the damage width is 80mm, and the maximum damage depth is more than 1mm. The fatigue layer is removed by machining; the alloy powder with the weight percentage content: Cr20, Mo4, W5, Al0.8, C0.2, the balance Ni and the weight percentage: Cr20, W4, C0.1, Nd0.3 The alloy powder with the amount of Co is jointly repaired by laser cladding. The process parameters of laser cladding are: laser power 1800W, spot diameter φ4mm, spot moving speed 5mm / s; and then machine plus complex. Experience acceptance. After various tests, its hardness index reaches HB260~280, which is required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-destructive testing. The result of metallographic analysis shows that the structure of the cladding layer is a dense austeni...

Embodiment 3

[0033] Example 3 Rotor shaft of 50MW generator

[0034] The rotor weight is 26 tons, the length is 6m, the rotor shaft material is 34Cr2Ni4MoV, the gas seal journal diameter is φ420mm, the damage width is 50mm, and the maximum damage depth is 0.8mm. The fatigue layer is removed by machining; the alloy powder with the weight percentage content: Cr25, Mo4, W5, B0.5, the balance Ni and the weight percentage: Cr25, W4, C0.2, N0.1, the balance Co The alloy powder is repaired by laser cladding together. The process parameters of laser cladding are: laser power 1200W, spot diameter φ4mm, spot moving speed 8mm / s; and machine-added complex. Experience acceptance. After testing, its hardness index reaches HB260-300, which is required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-destructive testing. The result of metallographic analysis shows that the structure of the cladding layer is a dense austenite structure. After more tha...

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Abstract

The present invention provides a laser repaired power generator and turbine rotor shaft, on its matrix surface on alloy covering layer which can be mutually merged with matrix surface and is different from matrix completely in components is formed, and on the surface where the matrix and alloy layer are connected a micromolten layer whose thickness is 0.05-0.1 mm is formed, and said alloy covering layer is nickel base, cobalt base or iron base alloy. Said invention also provides a laser repairing method of the described power generator and turbine rotor shaft. It adopts a pre-set laser melt-covering mode, and its technological parameters are: laser power 1200-2000 W, spot diameter 2-6 mm and spot moving speed 2-20 mm / s.

Description

Technical field: [0001] The invention relates to a generator, a steam turbine rotor shaft and a repair method thereof. Background technique: [0002] The rotor shafts of steam turbines and generators are large in volume, heavy in weight, high in accuracy, complex in production process, high in production cost, and long in cycle. And once there is a problem in operation, the impact will be huge. Therefore, the design of this type of rotor is infinite life design, that is, it can be used continuously for more than 20 years under normal process conditions. [0003] The general manufacturing process of the rotor shaft includes the integral forging type, the sleeve type, the combined type and the welding type. Regardless of the structural form, the quality requirements are relatively high. Due to the work at high temperature and high speed, the material is required to have a higher creep limit, good endurance strength, and better thermal fatigue and fracture resistance. The larger the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/04H02K1/28
Inventor 陈江王一兵张静波
Owner SHENYANG DALU LASER TECH
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