Producing good solder joints on today's complex PC boards requires the precise control of solder flux density, the most critical parameter in wave soldering. Unfortunately, it is
difficult to maintain the flux at a specified density with the majority of measuring devices available.
Flux density is measured and/or controlled with any of these instruments:
hand-held hydrometers
density meters
density controllers
flow measurement devices
automatic viscosity controllers
Of these, the automatic viscosity controller, a newcomer to wave soldering, is the only one capable of consistently accurate measurements. The viscosity control system will maintain specific gravity to within ± 0.005 gm/ml.
To download Reprint #140 Acrobat PDF file click HERE.
