Bicycle Mechanics - time for a new braze-on
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01-12-10, 04:05 PM
I got in a wreck a while back and screwed my hip up. I'm healed from that now. My bike suffered a bent braze-on which ended up bending off and breaking with the derailleur involved in the snafu.
I live in the DC area...do you know of anyone around here that can weld aluminum---aka pop the old braze-on remnants off, and weld a new one on to the frame?
Unless your tubes are asymmetrical or a weird size, it's a lot easier to use a clamp. You will have to smooth off the broken bit so it fits.
01-12-10, 04:53 PM
Here's a list of aluminum welders near D.C. If you ordered a braze-on online, you could probably bring your bike in and have them do it. (Or call your local bike shops and see if they know of a local framebuilder who's got experience with aluminum.)
01-12-10, 07:35 PM
If you can use a clamp, do so in preference to attaching another braze-on piece. The tubing has already been weakened by one heating and stressed by the crash that broke off the original braze-on. Putting another braze-on on the same piece of tubing is asking for trouble.
01-12-10, 07:58 PM
Actually if the welder knows to preheat the metal in accordance with the alloy properties then welding on a new dropout would actually relieve any possible the stresses in the area and restore it to like new or nearly like new. But this presupposes that the welder knows the needs of the different alloys.
01-13-10, 09:01 AM
in re: to the braze-on vs clamp posts, I have asymmetrical tubing so a clamp is a no-go. I will call around to the shops in the area and see how well their recommendations for welders match up with the Google Maps link BigVegan sent me.
Thanks for the help, all...I'll post back if I have luck with the fix!
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