..cold welding...

[Bootlegger]

 Can some one explain how this process takes place and what metals to stay away from to prevent it from happening.
 I am installing a carbon fiber B/C in a new wing and I plan to use 1/8" wire post with a piece of brass tubing for a bushing in the B/C  to keep it from moving around.
 Will this set up give me a problem with cold welding, and if so what is another method to prevent this from happening ??

  Thanks a lot...

[David_Stack]

Good Afternoon Gil;

  Are you sure you are not thinking of galvanic corrosion?  Looks like cold welding is a concern primarily in the vacuum of space, less of an issue in terrestrial environments...

  http://esamultimedia.esa.int/multimedia/publications/STM-279/

r/
Dave

[Phil Krankowski]

I think he is talking about galling
http://en.wikipedia.org/wiki/Galling

Phil

[Dan McEntee]

   With the brass tube for a bearing on a steel wire rod, I wouldn't think you would have any issues with galling or any other kind of seizing. The dis-similar metals make sort of a natural bearing in itself, especially brass. If you put any kind of lubrication on it at assembly, that should make the assembly last several life times. The bell cranks only rotates a pretty limited amount, and it a back and forth motion. I don't think I have ever heard of a bell cranks locking up on a pivot wire or rod.
   Type at you later,
     Dan McEntee

[Bootlegger]

 Fellow's I sure do thank you for all the answers..

[Don Hutchinson AMA5402]

This all goes back to the full fuselage F-86 D I built some time ago. I used the Dubro fuel can fitting for the bushing on the crank and a 1/8" wire axle. This particular one was a real close fit and actually seized up while someone else was flying the model. Fortunately, the axle was able to turn in the ply plates it was mounted in. Fixing it was fun! I use this fitting on the warbird drawings but suggest the builder drill it out to .128".
Don