Aluminium welding rods...NAC

[JanDebL at aol.com]

The major problem with welding aluminum is to keep the oxygen away from the 
weld to prevent aluminum oxide from forming and weakening the weld.  That's 
why an inert shielding gas is normally used for welding AL.  There have been 
attempts at using fluxed welding rods in standard electric welder machines 
but success has been limited because aluminum is so active that the oxide 
forms before the flux can coat the weld.  All of this doesn't mean the low 
temperature filler rods you describe wouldn't work for applications where 
only moderate strength is required.  Brazing works fine for similar joining 
ferrous materials and was never intended to equal the strength of a welding 
process which actually fuses the parent metal.  It sounds inexpensive enough 
to experiment with.  If you decide to try it, let us know how it works.
Jan Lahtonen