US4710103A
Expired / Lapsed
US
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Method for fastening blades on the periphery of the rotor body of a steam turbine and the turbo-machine produced by the method
Assignee: BBC BROWN BOVERI and COMPANY Ltd
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Filing: 1986-06-11
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Granted: 1987-12-01
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Expires: 2006-06-11
Abstract
Abstract Steam turbine blades are fastened in an outer layer of weld material applied by deposit welding to the outer surface of the rotor body, the composition of the weld material being optimally matched with respect to hot strength and/or corrosion resistance, in particular stress corrosion resistance, to the local mechanical, thermal and chemical requirements. A possible option is additionally to insert a deposit welded intermediate layer of medium alloying element content. Steels with 10-14% Cr, low carbon and additions of Mo and possibly V are preferred as the weld material for the layer.
Inventors
- 👤 Guy Faber
- 👤 Gottfried Kuhnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:38
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B23K9/00; B23K9/04; B23K9/044; B23K9/046; B23P; B23P15/00; B23P15/006; B23K35/001; B23K35/004; Y; Y10; Y10S; Y10S29/00; Y10S29/026; Y10S29/048; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321; Y10T29/49826; Y10T29/49885; Y10T29/4998; Y10T29/49988; Y10T29/49989
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
61 words
A rotor and blade arrangement for a steam turbine, comprising: a rotor body; an outer layer applied to the rotor body comprising at least one welding run of a steel that is one of high temperature corrosion resistance and stress corrosion resistance; said outer layer being machined for the purpose of receiving blades; and blades inserted into the machined outer layer.
Claim 2
Dependent Claim
61 words
A rotor and blade arrangement for a steam turbine, comprising: a rotor body; an outer layer applied to the rotor body comprising at least one welding run of a steel that is one of high temperature corrosion resistance and stress corrosion resistance; said outer layer being machined for the purpose of receiving blades; and blades inserted into the machined outer layer.
Claim 3
Dependent Claim
23 words
The arrangement according to claim 1, further comprising an intermediate layer of weld material located between the rotor body and the outer layer.
Claim 4
Dependent Claim
19 words
The arrangement according to claim 2, wherein the intermediate layer comprises the following composition: C=0.1-0.26% Cr=2-6% Mo=0-2% V=0-0.65% Fe=Remainder.
Claim 5
Dependent Claim
16 words
The arrangement according to claim 2, wherein the intermediate layer is recessed within the rotor body.
Claim 6
Dependent Claim
19 words
The arrangement according to claim 1, wherein the outer layer comprises the following composition: C=0.06-0.26% Cr=10-14% Mo=0-2% V=0-0.45% Fe=Remainder.
Claim 7
Dependent Claim
21 words
The arrangement according to claim 1, wherein the rotor body comprises the following composition: C=0.23% Si=0.12% Mn=0.64% Cr=1.6% Mo=1.1% V=0.28% Fe=Remainder.
Claim 8
Dependent Claim
24 words
The arrangement of claim 1, wherein the outer layer comprises a metallurgical composition that is different from the metallurgical composition of the rotor body.
Claim 9
Independent Claim
136 words
A method for fastening blades on the periphery of a rotor body of a steam turbine by firmly clamping and wedging the blades in recesses and/or protrusions of the rotor body, comprising: covering an annular portion of the outer surface of the rotor body, by means of deposit welding, with at least one layer, said at least one layer being formed by welding a run of one of a high temperature corrosion resistant and stress corrosion resistant steel, after solidification of the welding run, subjecting the part of the rotor body formed by deposit welding to machining by one of turning, milling and grinding for the purpose of forming at least one of a recess and a protrusion to receive the blades, and inserting the blades in said at least one machined layer of weld material.
Claim 10
Independent Claim
136 words
A method for fastening blades on the periphery of a rotor body of a steam turbine by firmly clamping and wedging the blades in recesses and/or protrusions of the rotor body, comprising: covering an annular portion of the outer surface of the rotor body, by means of deposit welding, with at least one layer, said at least one layer being formed by welding a run of one of a high temperature corrosion resistant and stress corrosion resistant steel, after solidification of the welding run, subjecting the part of the rotor body formed by deposit welding to machining by one of turning, milling and grinding for the purpose of forming at least one of a recess and a protrusion to receive the blades, and inserting the blades in said at least one machined layer of weld material.
Claim 11
Dependent Claim
51 words
Method as claimed in claim 8, wherein at least the part of the rotor body formed by deposit welding in the form of layers is subjected to a heat treatment in the temperature range between 600° and 750° C. for between 1 and 10 hours, before the insertion of the blades.
Claim 12
Dependent Claim
31 words
Method as claimed in claim 8, wherein a steel with the following composition is used as the weld material to be applied as an outer layer: C=0.06-0.26% Cr=10-14% Mo=0-2% V=0-0.45% Fe=Remainder.
Claim 13
Dependent Claim
30 words
Method as claimed in claim 8, wherein a steel with the following composition is used as the weld material to be applied as the outer layer: C=0.17-0.24% Cr=12% Mo=1% Fe=Remainder.
Claim 14
Dependent Claim
31 words
Method as claimed in claim 8, wherein a steel with the following composition is used as the weld material to be applied as the outer layer: C=0.17-0.24% Cr=12% Mo=1% V=0.3% Fe=Remainder.
Claim 15
Dependent Claim
29 words
Method as claimed in claim 8, wherein on the rotor body, an intermediate layer is first applied, and wherein a further, outer layer is applied to this intermediate layer.
Claim 16
Dependent Claim
31 words
Method as claimed in claim 13, wherein a steel with the following composition is used as the weld material to be deposited for the intermediate layer: C=0.1-0.26% Cr=2-6% Mo=0-2% V=0-0.65% Fe=Remainder.
Claim 17
Dependent Claim
30 words
Method as claimed in claim 13, wherein a steel with the following composition is used as the weld material to be deposited for the intermediate layer: C=0.15-0.2% Cr=4-6% Mo=1% Fe=Remainder.
Claim 18
Dependent Claim
31 words
Method as claimed in claim 13, wherein a steel with the following composition is used as the weld material to be deposited for the intermediate layer: C=0.15-0.2% Cr=4-6% Mo=1% V=0.5% Fe=Remainder.
Claim 19
Dependent Claim
21 words
Method as claimed in claim 8, wherein the rotor body comprises the following composition: C=0.23% Si=0.12% Mn=0.64% Cr=1.6% Mo=1.1% V=0.28% Fe=Remainder.
Claim 20
Dependent Claim
24 words
The arrangement of claim 8, wherein the outer layer comprises a metallurgical composition that is different from the metallurgical composition of the rotor body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |