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 laser welding equipment, machines/engines, liquid fuel engines, etc., can solve the problems of reduced service life, low surface hardness, etc., achieve high creep limit, good wettability, and good durability The effect of intensity
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Embodiment 1
[0027] Example 1 Medium and low pressure rotor shaft of 200MW steam turbine
[0028] The weight of the rotor is about 20 tons, the length is 6m, the maximum rotation diameter (last stage blade) is 2.4m, the material of the rotor shaft is 25Cr2Ni4MoV, the diameter of the main journal is φ300mm, the damage width is 250mm, and the maximum damage depth is more than 1mm. The fatigue layer is removed by machining; the alloy powder with the weight percentage content of Cr20, Mo4, W3.5 and the balance of Ni and the alloy powder with the weight percentage of Cr20, W4, C0.5 and the balance of Co are laser cladding respectively. The process parameters of repairing and laser cladding are: laser power 1500W, spot diameter φ4mm, spot moving speed 10mm / s; reshape by machining, and pass the acceptance test. After various tests, its hardness index has reached the HB240-260 required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-dest...
Embodiment 2
[0029] Example 2 300MW Generator Rotor Shaft
[0030] The weight of the rotor is about 40 tons, the length is 7m, the material of the rotor shaft is 30CrNiMo, the diameter of the main journal 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 of Cr 20, Mo 4, W 5, Al 0.8, C 0.2, and the balance of Ni and the weight percentage of Cr 20, W 4, C 0.1, Nd 0.3 The alloy powder with the remaining Co is repaired together with laser cladding. The process parameters of laser cladding are: laser power 1800W, spot diameter φ4mm, spot moving speed 5mm / s; and then machining and reshaping. Passed the acceptance. After various tests, its hardness index has reached the HB260-280 required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-destructive testing. According to the results of metallographic analysis,...
Embodiment 3
[0031] Example 3 50MW Generator Rotor Shaft
[0032] The weight of the rotor is 26 tons, the length is 6m, the material of the rotor shaft is 34Cr2Ni4MoV, the diameter of the air seal journal 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 of Cr25, Mo4, W5, B0.5 and the balance of Ni and the weight percentage of Cr25, W4, C0.2, N0.1 and the balance of Co are used Alloy powder is repaired by laser cladding together, and the process parameters of laser cladding are: laser power 1200W, spot diameter φ4mm, spot moving speed 8mm / s; and then machining and reshaping. Passed the acceptance. After testing, its hardness index reaches the HB260-300 required by the original shaft hardness, and there are no holes, slag inclusions, cracks and other defects in the non-destructive testing. According to the results of metallographic analysis, the structure of the cladding layer ...
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