Key Factors to Manage Filler Metal Creation on Aluminum Heat Exchangers 2013-01-1018
To assess the ability of a material to create filler metal flow
and fill the brazing joint areas during the brazing process, we
adapted a method which is called aluminum Flow Factor test. The
target is to take benefit of this test in order to reach an optimum
level of heat exchanger performance from project development
This paper studies similar aluminum clad material compositions
coming from different suppliers. After brazing process, significant
differences were noticed in the filler metal flow results.
This study highlighted the impact of brazing peak temperature to
create more or less flow of filler metal. The Flow Factor is
promoted by the increase of brazing peak temperature. It also
showed that regardless the material gage, at a low peak temperature
of 591°C, Flow Factor are quite similar around 0,18.
Even if the silicon particle size was not especially studied,
compared to others papers, this study didn't show a main impact
on Flow Factor results compared to other factors.