Linear friction welding of blades

摘要

A turbine compressor or turbine bladed disc assembly wherein the blades 6 include root portions 8 provided with opposed converging surfaces 9,10 and the disc 14 includes slots 11 provided with opposed diverging surfaces 12,13. In assembly the root portion 8 of a blade 6 is engaged in a slot 11 with abutting converging and diverging surfaces and the blade 6 is oscillated relative to the disc whilst pressure is applied radially to urge the root into close contact with the slot until melting temperature is reached whereupon the oscillatory motion is arrested and the pressure maintained as the converging and diverging surfaces coalesce. A hole 16 may be drilled through the assembled blade and disc assembly in order that communication may be made with cooling air passages in the blade.