Bill,
Years ago the British sports cars( Lotus, Lola,etc.) were fabricated with
low temperature nickel/silver rod and a torch. The rod is very strong (my
memory says somewhere around 70,000 PSI.)and flows at a low enough
temperature so is does not effect the metallurgy. I have used Allstate 11
and 13 fluxed rods and they do a good job. 11 flows like solder in the joint
and 13 builds fillets.
I built a racing Go Kart frame with it.
Howard Nafzger
----- Original Message -----
From: <ardunbill@webtv.net>
To: "Albaugh, Neil" <albaugh_neil@ti.com>; <land-speed@autox.team.net>
Sent: Tuesday, January 07, 2003 6:46 AM
Subject: Welding vs Brazing
> Neil, a couple days ago you touched on something that interests me, the
> subject of brazing racing frames with nickle-silver-brazing rod. When
> is brazing preferable to welding, and what are the specific materials to
> use?
>
> Since you seem knowledgeable about both welding and brazing, could you
> elaborate on what place brazing has for fabricating racing frames. From
> reading, I gather that some of the world's expert fabricators like
> brazing for that job, even though most in the US seem to prefer welding.
> But, about 40 years ago I recall that one of the star European sidecar
> racers got killed in a race when, it was reported, some frame parts he
> had brazed up, let go.
>
> The famous Manx Norton mc racing frames were made from Reynolds 531
> tubing brazed together, we were always told, for one example.
>
> We can buy nickle-silver brazing rod readily, and I've used it for some
> non-critical parts. No question that it is tough and hard, but with
> brazing we're talking a tough bond only, not melting the steel together
> as in true welding. I made an offset tool to tighten the head nuts on
> my engine by brazing some pieces together, and it was okay up to a very
> high torque figure, then the brazing let go. So I re-made the tool and
> had a pro weld it, and it is holding now.
>
> Bottom line, evidently brazing is not quite as strong as welding.
>
> Inquiring minds want to know. Bill
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