Method for replacing worn airseal lands on engine compressor or turbine disks

A method for the replacement of an airseal land on a disk, said disk comprising a compressor or turbine disk manufactured of a wrought nickel-base superalloy or titanium alloy, said method including the steps of:

• a) removing a pre-existing airseal land, leaving a stub portion thereof to provide a bonding surface to which a replacement airseal land ring may be bonded;
• b) preparing a replacement airseal land ring of a wrought alloy selected so as to be readily forge joined to said stub, said replacement ring having a bonding surface of the same dimensions as said stub, and a cross-section having a narrower bonding surface than the load bearing upper section thereof;
• c) positioning the bonding surface of said replacement ring adjacent to the bonding surface of said stub, and drawing a vacuum around said bonding surfaces;
• d) applying a bonding force to said replacement ring and said stub;
• e) locally heating the interface between said replacement ring and said stub to a temperature within the solution range of the alloy of said replacement ring but not causing localized melting, to obtain a solid state bonding at said interface;
• f) removing said force and subjecting the bonded assembly to an isothermal vacuum heat treatment so as to optimize properties thereof;
• g) removing said bonded assembly, and machining the replacement airseal land to the desired final configuration.