Method of repairing the turbine airfoil nozzle segment
AssigneeGeneral Electric Company
InventorsBrian Arness, Graham Sherlock, Joseph Moroso, Stewart Beitz, Graydon Peters
Life of this patent
Estimating the term…
Abstract
A trailing edge coupon for the trailing edge of a airfoil of a turbine nozzle segment is welded to an airfoil section of the nozzle segment having a damaged trailing edge portion removed. The coupon includes film cooling holes spaced one from the other along a pressure side wall portion of the coupon and a plurality of radially spaced openings along the trailing edge. By welding the pressure and suction side edges of the coupon to the pressure and side edges of the remaining portion of the airfoil, the operating life of the nozzle is extended.
Claims5
1-6. (canceled)
A method of repairing an airfoil of a turbine nozzle segment comprising the steps of:
- (a) removing a damaged trailing edge portion of the airfoil leaving a remaining airfoil section including leading edge and intermediate sections;
- (b) providing a trailing edge coupon having pressure and suction side wall portions, a plurality of film cooling holes generally radially spaced one from the other along a pressure side wall portion of the coupon and a plurality of radially spaced openings, and a plurality of radially spaced ribs extending between opposite pressure and suction sides of the airfoil;
- and
- (c) welding along opposite pressure and suction sides of each the remaining airfoil section and the coupon respectively to secure the coupon to the remaining airfoil section.
A method according to claim 6 including welding opposite radial edges of the coupon to inner and outer platforms.
A method according to claim 6 including forming a fillet at the juncture of the opposite radial edges of the coupon and the inner and outer platforms respectively.
A method according to claim 6 wherein step (b) includes providing a trailing edge coupon having the number of the openings exceeding the number of the holes by a factor of at least two.
Dependencies are inferred from the claim text.