Choose a flux. Very similar to the solder, the flux really should be specialized for aluminum or for The mixture of metals you propose to hitch. The easiest selection is to get the flux with the exact same source as your solder, as they are possible meant to work together. https://claytondqbkw.topbloghub.com/33464912/top-latest-five-types-of-solder-to-use-on-aluminum-radiator-urban-news