Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1980-05-16
1982-11-16
Crane, Daniel C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29 2535, 73583, 73618, 164 41, 249175, B23P 1502, B22D 200
Patent
active
043588824
ABSTRACT:
Some turbine blades are produced by casting, using the lost wax process. The blades may include cooling air passages and the wall thickness of these is tested ultrasonically i.e. by transmitting and receiving acoustic pulses from and to, a common transducer.
Lately the blades, having been cast, are directionally solidified. This process changes the grain structure such that during inspection, pulses received by the blade, have been dissipated. The invention provides ultrasonic testing ability by using a unidirectional pulse transmission system, resulting in pulses which, having passed outwards through the passage wall, still have sufficient energy to effect an indication of wall thickness.
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Crane Daniel C.
Rolls-Royce Limited
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