Depends on what the use of the brass is I've tig welded lots of hand rail and table legs 1/8" tubing using AC and 1/8 zirtung 250amps with balance around 50% and a large gas lens with strips of the parent metal as filler. the zinc fumes like crazy, coler match is close strength is fair about 2 out of every 10 inches ends up with porosity and needs to be ground out and redone but it can be done use a fume hood or do outdoors. If you have enough skill to tig dirty Alum. with a little practice you can weld brass