Go with a flux. Very like the solder, the flux ought to be specialised for aluminum or for The mixture of metals you intend to join. The simplest solution is to acquire the flux within the similar supply as your solder, as They may be likely intended to work collectively. https://types-of-spoilers12222.losblogos.com/26954428/getting-my-types-of-solder-to-use-on-aluminum-radiator-to-work