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Thread: BB Follow on braze

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    Default BB Follow on braze

    Hi - A few years ago, I took the UBI course, and after completing the BB shell braze the instructor pointed out the lack of silver in certain areas. It was recommended that I add silver when brazing in the CS, which I did, and all that worked out well. My frame has shown no signs of stress over the years since.

    Belatedly, I am working on frame #2 , and after completing the BB (and front triangle) it appears I repeated that mistake. In a normal world I would have gotten after that and used the same process I learned in the course when brazing in the CS. Complication: COVID, so I haven't been in the shop for awhile. I'd like to get after it again but the frame has been sitting for months. 2 questions:

    1. Is it okay to use the same process I used in the course or is there a problem with the amount of time between the first and second heating? i.e. if I had gotten after it the next day (as I did in the course), does that make it OK, while waiting a few months makes it not OK?

    2. Not related to the time issue in #1 , I have always been curious about reheating a joint and the process around cleaning and fluxing. Realzing I am not taking the joint completely apart, cleaning and fluxing all around, is there a process one follows when reheating a joint in regards to cleaning and flux? Been wondering about this for awhile and have never seen it discussed, so if this has been hit elsewhere a link is appreciated.

    Thanks much.

    Mike Cormack
    Vancouver, BC

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    Default Re: BB Follow on braze

    I’d never reheat a joint, or suggest it as a fix, in order to improve its integrity. If you want / need to dress up an edge because of how it looks, simply use the smallest tip and lightest flame possible and quickly reflow some of the filler material.

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    Default Re: BB Follow on braze

    Thanks Richard. Good to know.

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    Default Re: BB Follow on braze

    And don't forget the importance of cleanliness and plenty of flux.
    Bill Fernance
    Bicycle Shop Owner
    Part Time Framebuilder
    Bicycle Tragic

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    Default Re: BB Follow on braze

    Quote Originally Posted by progetto View Post
    And don't forget the importance of cleanliness and plenty of flux.
    That was well emphasized at UBI for sure. Thanks for that.

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