Is this repairable?

[Charles Hobbs]

This is a 1978 Trek, Columbus tubing.  I indented the stays as part of a 650b conversion.  When I indented the stays I didn't notice any problems, but after sandblasting this crack was made apparent.  It is about 3 inches and is perfectly on the bottom apex of the oval stay.

I am happy with all the mods I made to the frame; I love these old TREKS , no one will ride this but me so I am not worried about hurting anyone else.  So should I try to save it?  Or cut my losses?  I was wondering if I could drill each end to stop the crack from propagating, and then filling the the entire thing with brass.

Thoughts?

Charles Hobbs, Colorado

[Mark Stonich]

If that were mine, I’d try to blacksmith a close fitting cap for it from an old chainstay and silver braze it over the slit. I’d aim for about half an inch wide and 1/2” past the ends of the crack. Then I wouldn’t let anyone else ride it. 

+1 on the holes to stop the crack propagating 

[m-gineering]

I'd probably run a TIG bead over it and call it good, it's not seriously
loaded, and don't see it failing catastrophicaly.
Or run a cutting disk throught the crack, and braze in a ridge and make
all sorts of claims for it

> Charles Hobbs, ColoradoIMG_6969.jpg
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Marten Gerritsen
Kiel Windeweer
Netherlands

[Charles Hobbs]

I am strictly a self taught amateur.  I do this for fun.  Now I am contemplating replacing the stay, mostly to put a challenge in front of myself.  If anyone is willing to share tips in that regard I would appreciate it.

Thanks for all the knowledge!

Charles Hobbs

[Michael Catano]

Another quick cosmetic fix would be to drill a series of small pinholes along the length of the crack, brass braze in the nails to fill the pinholes and seam, then file the whole thing flush with the stay.

Just make sure there’s a way to soak and drain adequately so you don’t have flux flakes ringing around the stay for time and eternity. 

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[Paul Anthony Judd]

Better would to be drill the holes at the ends of the crack to reduce stress concentration and silver solder a cap over it.

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