Rolls-royce Corporation

Gavin J Baxter

Simon Edward Bray

Quinlan Yee Shuck

Mark Christopher Hardy

Andrew Robert Walpole

Grant J Gibson

Christopher Paul Heason

Alistair J E Smith

John P E Forsdike

Michael D Rowlson

John Forsdike

Amar M Varia

Mark G Horwell

Stephen M Beech

Yogiraj Pardhi

Christopher Heason

Andrew Walpole

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

The novel nickel-base superalloy useful in an additive manufacturing process or a powder-based manufacturing process includes the following composition in wt %: Cr 8.0-8.5; Co 9.0-9.5; Mo 0.4-0.6; W 9.3-9.7; Ta 2.9-3.6; Al 4.9-5.6; Ti 0.2-1.0; Hf 0-0.05; C 0.005-0.03; B 0.005-0.02; Zr 0.005-0.1; Nb 0.2-1; Mn 0-0.6; and S 0-0.002 (&#x2264;20 ppm); the balance nickel and incidental elements and unavoidable impurities.

Nickel-base superalloy and use thereof

A method of repairing a metallic component (formed from a first material) by powder feeding laser deposition, comprises the step of depositing a plurality of first repair layers onto a repair surface of the component to form a first repair zone, the first of the plurality of first repair layers comprising a mixture of A/B by weight of the first material and a second material, each nth successive one of the plurality of first repair layers comprising a change in the proportion of the second material in the mixture, the last of the plurality of first repair layers comprising a mixture of C/D by weight of the first material and the second material.

Additive layer repair of a metallic component

A system includes an electric motor including a housing enclosing a substantially-sealed internal environment, a pump including an inlet connected to the substantially-sealed internal environment of the electric motor via a first conduit, and a fluid supply storing a makeup fluid, the fluid supply including an outlet connected to the substantially-sealed internal environment of the electric motor via a second conduit. The pump is configured to create a negative pressure within the substantially-sealed internal environment of the electric motor to mitigate potential contamination of an external environment of the electric motor with the makeup fluid.

Negative pressure motor sealing

A method is disclosed for controlling a process in which a componentis moved relative to another componentsuch that at least one of the componentsexperiences a reduction in magnitude in at least one dimension. Such processes may include for example friction welding. The method comprises monitoring energy input to the process and adjusting an input parameter for the process based on the monitored energy input. The monitoring of energy input is performed before any reduction in component magnitude has begun to take place.

Process control method

A method of determining the quality of a friction weld between two components, the method comprising joining two components together using a friction welding process, measuring the loss of length of the components as a function of time during the friction welding process, determining the double differential with respect to time of the loss in length of the components as a function of time, determining the quality of the friction weld by calculating the Rvalue of the linear fit to the loss in length of the components as a function of time over a defined time period, determining the end of the defined time period by identifying the start of the final positive peak of the double differential with respect to time of the loss of length of the components as a function of time, calculating Rfrom the least square difference of the linear fit over the defined time period of the loss of length of the components as a function of time and comparing the calculated value of Rwith acceptable values of Rto determine if the quality of the friction weld is acceptable.

Determining the quality of a friction weld using a double differential

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Sheffield, United Kingdom

Gavin J Baxter