|
|
|
step4 : Fluxing the joint
The choice of flux is as important as the choice of filler metal.
(See the Brazing Fluxes area of this site for more information.)
Ideally flux should be applied to both components before assembly
and prior to heating.
The flux must melt and become active below the melting point of the
brazing alloy. It must stay active right through the brazing cycle,
removing the oxides formed on the parent metals.
If the flux residues appear blackened and glassy, the flux has probably been
exhausted during heating. This could be because either insufficient flux has
been used or the components have been overheated, and a flux with greater
time and temperature stability should therefore be used.
|
|
|
