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Dave,
According to the turbo books,
friction welding has long been the method by which the turbine wheel is affixed
to the shaft. As I understand it they take a turbine wheel and place it in
a fixture and spin it (or maybe its the shaft they spin - I forget).
But, in any case when it reaches some magic rpm they forcefully press the wheel
against the shaft (one or the other is stationary). The resulting heat
from the friction causes the metal to melt and fuse welding the two parts
together. Hence the name friction welding.
. At least that is my understanding of
it.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Saturday, July 10, 2004 5:45
PM
Subject: [FlyRotary] Re: Three candidates
for Turbo Failure
My somewhat semi-random thoughts ...
Dale
R.
COZY MkIV-R13B-NA #1254
>loose compressor wheels
I'm afraid
incorrect terminology may have sent you off in the wrong direction. It's the
turbine wheel that failed, not the compressor wheel. On each occasion the weld
broke right at the base of the turbine wheel, the wheel came off and
blocked the exhaust outlet.
Thanks for all the
brain work. Very interesting stuff.
Regards,
john
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