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)