Bill;
There's a wealth of mis-information floating around about "fillet brazing"
(also called "braze welding") so I'll try to help straighten out some of
this confusion.
First, fillet brazing is distinctly different from the more common type of
brazing-- both in filler rod material, technique, and joint temperature.
Both types of brazing are best done with an oxy-acetylene torch although
other gasses are sometimes used with O2 (MAPP, natural gas, or propane),
both use a filler rod, and both do not involve melting the base metal, only
the filler rod. Both types of brazing also require clean, well-fitting
joints and the use of a flux.
.....Much more is contained in a longer response but it may be too long to
get posted....we'll see.
Regards, Neil Tucson, AZ
-----Original Message-----
From: ardunbill@webtv.net [mailto:ardunbill@webtv.net]
Sent: Tuesday, January 07, 2003 6:47 AM
To: Albaugh, Neil; land-speed@autox.team.net
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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