The brazing alloy is typically introduced into the joint area in the form of wire segments, foil, shims, or as powder or paste. For larger production volumes it is economically advantageous to pre-coat contact tips with a thin layer (< 100 µm) of brazing alloy.

Brazing fluxes consist of non-metallic materials, mostly salt mixtures of boron and halogen compounds ''(Table 4.2)''. Their purpose is to remove oxides from

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.