In answers to my question about history of welding, folks mentioned that
silver soldering and brazing came before welding.

I realize I am not completely sure of the difference. Is the difference
the material used? That is, if you are welding steel, is it only
welding if you are using steel rod? Using solder is soldering, brazing
rod is brazing?

Don Stauffer wrote:

Is the difference
the material used? That is, if you are welding steel, is it only
welding if you are using steel rod? Using solder is soldering, brazing
rod is brazing?

Welding is, when the base-material (workpiece) is partial molten.
brazing is soldering above 400 deg. Celsius and below welding.
Soldering is soldering below 400 deg. Celsius.

At least that's the German/DIN (ISO?) definition.
BTW: We say "soft soldering" and "hard soldering" to distinguish brazing
and soldering.

HTH,
Nick
--
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"Der Behälter fasst 200.000 Kubik-Liter."
Wie viele Quadrat-Stunden braucht es dann wohl, um ihn voll zu bekommen?

"Nick Müller" wrote in message
...
Welding is, when the base-material (workpiece) is partial molten.
brazing is soldering above 400 deg. Celsius and below welding.
Soldering is soldering below 400 deg. Celsius.

Of course, there's a metallurgical side to that gray area I'm sure...
something about braze fillers interlocking in the base metal. Not that it
manages to overturn the old 900°F-is-brazing definition.

For example, soft-solder some pieces of lead. You're hard-pressed to call
that anything but a braze!
Zinc and aluminum stick to iron, but good luck getting a stable brazed
joint. Every steel crucible I've had aluminum stuck to, the aluminum just
peeled off like solder (if harder).

Electrical soldering is also a lot of welding, at least if you're redoing
joints.

Tim (has "welded" towers of solder with spare blobs and spare time)

--
"California is the breakfast state: fruits, nuts and flakes."
Website: http://webpages.charter.net/dawill/tmoranwms

On Sun, 5 Jun 2005 18:23:15 +0200, (Nick Müller)
wrote:

Don Stauffer wrote:

Is the difference
the material used? That is, if you are welding steel, is it only
welding if you are using steel rod? Using solder is soldering, brazing
rod is brazing?

Welding is, when the base-material (workpiece) is partial molten.
brazing is soldering above 400 deg. Celsius and below welding.
Soldering is soldering below 400 deg. Celsius.

At least that's the German/DIN (ISO?) definition.
BTW: We say "soft soldering" and "hard soldering" to distinguish brazing
and soldering.

HTH,
Nick
Welding, or "fusion welding" fuses the two (or more) parts together
into one more or less contigous part. This can be done either by
strictly heating the parts, or by a combination of heat and impact.
(forge welding, or hammer welding)
Brazing and soldering differ in the alloy of the filler used; but in
both cases the base metal is NOT melted.GENERALLY, soldering, or soft
soldering is under 400C, and brazing, or hard soldering is higher, but
in practice some soft solders may require higher temps. Some also
require higher heat to remelt than to melt (some Eutectic solders can
have initial flow temps something close to 100C lower than remelt
temps)

Tim Williams wrote:

Of course, there's a metallurgical side to that gray area I'm sure...

Of corse.

something about braze fillers interlocking in the base metal. Not that it
manages to overturn the old 900°F-is-brazing definition.

Every soldering / brazing (and even welding to some extend) is about
diffusion of two (different) metals. Yes even soldering steel. Soldering
not only "clues" on the surface, it also is going some ore more atomical
layers deep.

For example, soft-solder some pieces of lead. You're hard-pressed to call
that anything but a braze!

By definition, it is soldering.


You might call me dumb, but brazing for me comes from the sound of doing
the job with brass and iron. :-)


Nick

--
Motormodelle / Engine Models
http://www.motor-manufaktur.de