Doesn't this belong on the framebuilder's list?
e-JOHNNIE
Boise, ID
> In a message dated 7/1/02 3:06:47 PM Pacific Daylight Time,
> chuckschmidt@earthlink.net writes:
>
> << Never heard of a "soft" brazed joint on a steel bike... maybe an
> incompetently brazed joint, but never a soft one.
> >>
> Comments are reserved for old school tubing. If you get it too hot, a lot
of
> the strength goes away. Columbus states in their catalogue that if you
keep
> it to silver brazing temperature, the tubing only loses 5% of its
strength. I
> had a brand new Eddy Merckx. I cannot begin to tell you how little effort
it
> took to move the frame a lot! It wasn't the tubing. A silver brazed frame
> with the same tubes was a "mofo" to move. If you heat it enough, you ruin
the
> steel. We could get technical and say it's from improper i.e., too rapid,
> cooling or any number of other things. My understanding is it isn't
> necessarily heat (within limits) but, time-at-temperature, that counts.
> That's why someone really good can build a strong frame using brass. It's
> hard to get that good joint quickly using brass.
> Stevan Thomas
> Alameda, CA