Single position turbine rotor repair method
AssigneeGeneral Electric Company
InventorsJohn Francis Nolan, Thomas Eugene Gustafson, David John Grubish
Life of this patent
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Abstract
A method of repairing a turbine rotor wheel having an annular damaged dovetail includes removing the annular damaged dovetail from the turbine wheel, leaving a wheel body having a rim. A forged ring is welded to the rim and dovetails are formed in the forged ring to accommodate turbine bucket dovetails. The welding process including preheating, welding, and stress-relieving are performed while the rotor under repair is disposed in a lathe for rotation about a horizontal axis. The turbine rotor repair is accomplished from start to finish without displacing the rotor from the lathe.
Claims14
A method of repairing a turbine rotor wheel in a single position repair device, comprising the steps of:
- disposing the rotor undergoing repair in the device with the rotor axis lying horizontal;
- rotating the rotor in the device about the horizontal axis;
- and
- while rotating the rotor about said horizontal axis and without displacing the rotor from the device, (a) removing an annular damaged dovetail from the turbine wheel, leaving a reduced diameter turbine wheel body, (b) welding a ring about the turbine wheel body in place of the removed damaged dovetail, (c) stress-relieving the rotor by applying heat, and (d) forming a dovetail in the ring for receiving turbine bucket dovetails.
A method of repairing a turbine rotor wheel in a single position repair device, comprising the steps of:
- rotating the rotor in the device about a generally horizontal axis;
- and
- while rotating the rotor about said horizontal axis and without displacing the rotor from the device (a) removing an annular damaged dovetail from the turbine wheel, leaving a reduced diameter turbine wheel body, (b) welding a ring about the turbine wheel body in place of the removed damaged dovetail, (c) stress-relieving the rotor by applying heat and (d) differentially controlling the temperature of the wheel body and the ring during step (b).
A method of repairing a turbine rotor wheel comprising the steps of:
- rotating the rotor about a generally horizontal axis;
- and
- while rotating the rotor about said horizontal axis and without displacement of the rotor from said horizontal axis thereof, (a) removing an annular damaged dovetail from the turbine wheel, leaving a reduced diameter turbine wheel body, (b) welding a ring about the turbine wheel body in place of the removed damaged dovetail, (c) stress-relieving the rotor by applying heat, and (d) forming a dovetail in the ring for receiving turbine bucket dovetails.
Dependencies are inferred from the claim text.