John:
Depends on the brazing alloy being used and just how "red" it was. I remember Eddy had an ad in the cycling mags. when he set up shop having frames built with his name on them after retirement, and the ad showed an orange-hot BB area. Looked a little toasty to me, but steel is remarkably tolerant of heat (up to a point, of course...). I suspect that more joints fail on steel lugged frames due to insufficient heating than due to overheating. Pro builders, any input on that subject? Of course, inputting just the right amount of heat to get a 100% sound joint without going too hot will result in the least amount of annealing & reduction in toughness of the tubing, and is where the ace builder's skill comes into play!
Greg "only built two framesets total, so no expert am I" Parker
-------------Forwarded Message-----------------
From: John Taglia, INTERNET:jtagli1@uic.edu To: , INTERNET:Classicrendezvous@bikelist.org
Date: 10/16/00 8:08 PM
RE: Re: [Classicrendezvous] Mexico vs Super (was: Colnago quality)
The entire BB and surrounding tubes and bright red?
At 07:14 PM 10/16/2000 -0400, gregparker1 wrote:
><snip>
>
>I think a silly early '80's that Colnago ran spoke tons about the emphasis
>of marketing over quality. The ad showed a relieved Colnago bottom bracket
>being heated by a torch,heated cherry red. Yup, that's quality.
>
><snip>
>
>Welllll..... Dull cherry is appropriate for silver-brazed joints at temp.
>Orange-ish would be right for some brass alloys. Good thing it wasn't
white-hot!
>
>Greg Parker
>
>
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