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flyadive(at)aol.com
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 Posted: Wed Nov 22, 2006 2:57 pm Post subject: RV-List:Fuel line question (Dana) Now Steel fittings |
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Dana, posts some good reasons to use steel fittings but the real reasons is much more simple ...
GAULING ... Some call it FRETTING ... I don't want to get into definitions but what happens is Aluminum running against Aluminum as in THREADS causes pieces of aluminum to be puller from each other. This CLOGS the threads and will prevent the fittings from coming apart. Get a bigger wrench you say! Then the result will be SNAP OFF ... Not to be confused with the tool manufacture SNAP ON.
Bottom line:
Do not aluminum threads against each other.
Barry
"Chop'd Liver"
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Vanremog(at)aol.com
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| Posted: Wed Nov 22, 2006 8:11 pm Post subject: RV-List:Fuel line question (Dana) Now Steel fittings |
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In a message dated 11/22/2006 3:00:15 P.M. Pacific Standard Time, flyadive(at)aol.com writes:
| Quote: | | GAULING ... Some call it FRETTING |
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Galling and fretting are, technically speaking, two different phenomena. Galling is actually a friction weld, where the intimacy of two like materials causes them to roughen locally and fuse together at the high pressure interface. It can be broken up thru the use of certain lubricants (molydisulfide, fuel lube and Loctite PST reduce the galling of aluminum and stainless steel fittings).
Fretting is the result of micromotion or hammering together of two non-intimate surfaces. This results in work hardening, surface removal exposing fresh surfaces to be degraded and ultimately micro-cracking.
GV (RV-6A N1GV O-360-A1A, C/S, Flying 816hrs, Silicon Valley, CA)
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