Abstract:
A method of the present disclosure includes of repairing a core stiffened structure with structural foam. Another method includes splicing core members together using structural foam. Another method includes joining a core member to a structure using structural foam. Another method includes using structural foam to stabilize a core member during a machining process. Another method includes stabilizing a core member with structural foam to prevent the core member from crushing in autoclave pressure. The present disclosure further includes a core stiffened structure have a core member with structural foam therein.
Abstract:
A gas turbine nozzle can be refurbished to reduce downstream deflection. The outer shroud of the gas turbine nozzle is held in a fixture, and then the nozzle is heated. The heated nozzle is then reshaped by a force exerted upon the inner shroud of the gas turbine, reducing the downstream deflection of the nozzle. After the deformation of the nozzle, an aft hook of the nozzle that has been adjusted by previous refurbishment efforts can be rebuilt to remove the previous adjustments.
Abstract:
A method and tooling for assembling a guide vane stage that includes an inner shroud and an outer shroud that are coaxial and interconnected by radial airfoils, the method including holding plates pressed against an outer surface of the inner shroud so that the plates cover gaps formed between openings in the inner shroud and the airfoils at least in part and in a manner that is leaktight, and applying a sealing resin to the inner surface of the inner shroud so that the resin fills the gaps and so that radially inner ends of the airfoils are embedded in the resin.
Abstract:
A gas turbine vane containment cap is attached to an inboard surface of the vane inner shroud by penetrating flat weld filler, formed in a root gap between the cap and inner shroud. A semi-circular bead weld filler is formed outboard the penetrating weld filler closer to the vane exterior. Vane containment caps so welded are more resistant to in-service cracking along weldments.
Abstract:
A method for repairing a flange of a rotor, to a transverse surface of which a disk of a fan in an upstream turbo-fan engine is attached. The flange includes, in a form of a ring, openings for connecting to the disk and intermediate discharge openings. Wear marks are formed by friction of the fan blades on the flange. The method includes machining spot facings onto the flange, in areas with wear marks; placing anti-wear slugs in the discharge openings that can be covered by the blades during friction; and the spot facings extend between the connection openings and are circumferentially limited by clamping surfaces of the connection between the disk and the flange.
Abstract:
An airfoil (112) including an internal cooling circuit (136) to direct cooling fluid (120) through an interior of the airfoil. The airfoil also includes a trailing edge (114′) defining plugged holes (115) and cooling holes (116) along a radial direction (117). A selective group (314) of the cooling and plugged holes are based on a reduced cooling fluid requirement at the trailing edge (114′) resulting from an improved thermal barrier coating (126). A process (200) is also provided including removing (202) an airfoil from service in a gas turbine engine and adding or improving (204) a thermal barrier coating on the airfoil. The process also includes selectively (206) plugging holes in the airfoil in response to a reduced cooling fluid required through the airfoil as a result of the added or improved thermal barrier coating.
Abstract:
A method for repairing a guide blade segment fashioned as a twin guide blade segment within a guide blade composite element, the guide blades being formed from a nose segment and a rear edge segment, the method having identification, within a guide blade segment, of a non-repairable guide blade to be separated from the guide blade composite structure; separation of a non-repairable guide blade from a one repairable guide blade in a first plane of division; division of at least one separated guide blade in a second plane of division between the nose segment and the rear edge segment; reconditioning of the at least one repairable nose segment and/or rear edge segment; joining of a reconditioned and/or new nose segment to a reconditioned and/or new rear edge segment to form at least one guide blade; and joining of at least two guide blades to form a guide blade segment.
Abstract:
A method of repairing a seal wire groove is disclosed, the groove forming an annular structure having an outer surface and an inner surface and defining an original profile when new, comprising the steps of: removing a less-than-annular portion of the original profile of the groove to remove damaged portions of at least one of the inner and outer surfaces thereby forming a void; adding new material to the void; and shaping the new material to form a new profile of the groove.
Abstract:
In accordance with an exemplary embodiment, a method for repairing a damaged metallic component using additive manufacturing techniques includes separating a damaged portion of the damaged metallic component from an undamaged portion of the damaged metallic component, measuring the undamaged portion to determine the dimensions of the removed damaged portion, fabricating a replacement portion using additive manufacturing techniques in accordance with the determined dimensions of the removed damaged portion, and joining the replacement portion with the undamaged portion of the damaged metallic component to form a repaired metallic component.
Abstract:
A method for repairing a rotor of a turbine includes providing a rotor having a groove portion defined by a circumferential portion of the rotor. The circumferential portion of the rotor is removed to create an opening to provide access to the groove such that the opening, immediately adjacent the groove, is narrower than the groove. A guide block may be extended into a receiving slot separating a first protruding surface from a second protruding surface of the rotor such that a weld area slot of the guide block extends over at least a portion of the opening. The opening may be welded adjacent the guide block to close at least a portion of the opening.