the brazing surfaces and prevent their new build-up in order to allow a thorough wetting of these surfaces by the liquefied brazing alloy. Fluxes have to be activated already at a temperature below the working range of the brazing alloy. They are selected mainly according to the working temperature of the brazing alloy and the base material to be joined.

[[File:Commonly Used Brazing Alloys for Electrical Contacts.jpg|right|thumb|Commonly Used Brazing Alloys for Electrical Contacts]]