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US 4,060,883 AGranted
Compound turbine rotor and method for manufacturing elements constituting such a rotor
AssigneeSociete General de Constructions Electriques et Macaniques Alsthom
InventorsAndre Coulon, Rene Perrin
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Abstract
The invention concerns welded turbine rotors. It is characterized in that, n the elements constituting a welded rotor which consist of a blade bearing block having at least one axial protuberance, that axial protuberance is made of steel having a lower carbon and nickel content than the remainder of the element and is joined thereto by a transition zone also made of steel. The invention applies more particularly to high-power steam turbines.
Claims2
A method for manufacturing a turbine rotor comprising the steps of:
- forging blade bearing blocks made of a steel comprising carbon and nickel;
- joining at least one axial protuberance to each block by casting a transition zone between the axial protuberance and the block from a consumable electrode with said protuberance being formed of steel having a carbon content and a nickel content lower than those of said block, and wherein said consumable electrode comprises steel having a carbon content between the carbon content of said block and said protuberance and having a nickel content between the nickel content of said block and said protuberance;
- reforging and heat treating said blocks with their axial protuberances;
- and
- welding of axial protuberances of respective blocks together to form an axial succession of blocks.
2 more elements
Dependencies are inferred from the claim text.