Rolls-Royce Corporation

John P E Forsdike

Simon Edward Bray

Andrew Robert Walpole

Gavin J Baxter

Peter E Daum

Alistair J E Smith

Philip S Trickey

A method of joining a first component to a second component at respective connection surfaces, comprising, in order, applying a local surface treatment to the connection surface of at least one of the first and second components in order to locally alter the microstructure to a depth of between 60 &#x3bc;m and 10 mm below the connection surface; and joining the first component to the second component using a welding process.

Joining method

A method is provided of replacing a damaged blade of an integrally bladed rotor assembly including a disc and a plurality of blades extending outwardly from a rim of the disc. The method includes the steps of: removing the damaged blade to leave a blade repair stub projecting from the rim; locating sacrificial supports at the underside of the rim beneath the repair stub, the supports projecting axially beyond the trailing and leading edges of the rim; depositing metal around the trailing and leading edges of the repair stub, the deposited metal, supported by the sacrificial supports, projecting axially beyond the trailing and leading edges of the rim; attaching a replacement blade to the repair stub by linear friction welding; and removing excess deposited metal, upset metal from the linear friction welding, and the sacrificial supports.

Method of replacing damaged aerofoil

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Worcestershire, United Kingdom

John P E Forsdike