Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Welded – cemented or fused
Patent
1999-06-08
2000-11-28
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Welded, cemented or fused
416201R, 416198A, 416 61, F01D 506
Patent
active
061526975
ABSTRACT:
A steam turbine different material welded rotor, constructed by rotors of different materials being jointed together by welding has the strength of a jointed portion increased and inspection of the jointed portion facilitated. A bearing portion rotor 1 and high temperature portion rotor 2 are jointed at weld portion A, the high temperature portion rotor 2 and low temperature portion rotor 3 at weld portion B and the low temperature portion rotor 3 and bearing portion rotor 4 at weld portion C. Cavity portions 5, 6 are formed in the weld portions B, C, respectively. Inspection holes 7, 8 are also provided in the weld portions B, C. The high temperature portion rotor 2 is made of high heat resistant 12Cr steel and other rotors are made of low alloy steel, wherein the rotor 1 is of 2.multidot.1/4 CrMoV steel and the rotors 3, 4 are of 3.multidot.1/2 NiCrMoV steel. Thus, the materials are less expensive and inspection of the weld portions becomes facilitated by the inspection holes 7, 8 and the cavity portions 5, 6.
REFERENCES:
patent: 3876335 (1975-04-01), Forcinal et al.
patent: 3967919 (1976-07-01), Coulon et al.
patent: 4696544 (1987-09-01), Costella
patent: 4962586 (1990-10-01), Clark et al.
patent: 5052803 (1991-10-01), Krauter
Konishi Tetsu
Magoshi Ryotaro
Look Edward K.
Mitsubishi Heavy Industries Ltd.
Nguyen Ninh
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