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US Patent 8661669 Method of making and joining an aerofoil and root

Patent 8661669 was granted and assigned to Rolls-Royce on March, 2014 by the United States Patent and Trademark Office.

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Patent abstract

A ducted fan gas turbine engine aerofoil is made by electron beam welding together at least two metal sheets (10) and (12) and electron beam welding that sub assembly via an end to a root that has been manufactured in a separate operation, and then heating the whole to a temperature that will convert the electron beam welds to diffusion bonds.

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