I tried Alumaloy Aluminium rods and a MAP brazing torch ...it works doing aluminium ok, small jobs. I was surprised! Just need to ensure you clean the surface with a stainless brush and the oxidisation surface of the join while molten with stainless wire rod.
It does work but I don't know how good with differing metals.
TIG should work...just fusing the material no filler! That said...TIG fusing point (welding settings) for one metal like brass will be very different to aluminium. Probably end up turning one metal to oxide ...?
Maybe spot weld?
