Aluminum Standards and Data provides definitions for welding and
brazing: Welding is the "joining of two or more pieces of
aluminum by applying heat or pressure, or both, with or without
filler metal to produce a localized union through fusion or
recrystallization across the interface". Brazing is the "joining
of metals by fusion of nonferrous alloys that have melting
points above 425 degrees C (800 degrees F) but lower than those
of the metals being joined. This may be accomplished by means of
a torch (torch brazing), in a furnace (furnace brazing), or by
dipping a molten flux bath (dip or flux brazing)." According to
the ASM Specialty Handbook: Aluminum and Aluminum Alloys:
"Brazing, by definition, employs filler metal having a liquidus
above 450 degrees C (840 degrees F) and below the solidus of the
base metal. Brazing is distinguished from soldering by the
melting point of the filler metal: solders melt below 450
degrees C (840 degrees F). Brazing differs from welding in that
no substantial amount of the