The purpose of the brazing flux is to promote the formation of sound brazed joints by protecting both the Base metal and filler metal from oxidation continually during the brazing cycle and preventing from Further oxidation from contact with the atmospheric oxygen. The brazing flux also serves to remove surface Oxides and therefore reduce the surface tension to promote freer flow of filler metal.
Why JO FLUX® series of fluxes will produce a better braze joint because: