The volume of fluid (VOF) model was used to track the capillary flow profile during wave soldering
in the FLUENT analysis.
As a result, there is the need to determine whether wave soldering
can deliver defect-free processes at these higher lead densities, or if an alternative technology exists.
(6,7) Fillet lifting is the separation on the topside fillet between the solder and the land at the end of wave soldering
Scapa has made available a high temperature masking tape for low static protection of delicate gold finger or rhodium PBC contacts, assembly holes and components during hot air leveling or wave soldering
This is the simplest form of selective soldering, but must be balanced between the need to do selective soldering and production wave soldering
. The selective aperture fixture effectively masks the areas previously soldered in the SMT reflow and non-selective wave soldering
process, while exposing only those areas to be selectively soldered.
To illustrate the concept, a Taguchi experiment was used to develop a robust process for Pb-free wave soldering
. The control factors selected were solder temperature, contact time, preheat temperature and flux amount.
In wave soldering
and hot air leveling, molten solder experiences a rapid heat loss at the point where it contacts the board surfaces and component leads.
Solder will fill the holes and achieve solder joints as reliable as wave soldering
. Solder preforms or "overprinting" paste on the solder mask can be used to increase the volume of paste required to fill each hole.
"iNEMI Lead Free Wave Soldering
Project; An Investigation of Reliability of Through-Hole Electrical Interconnects"
However, the company took equipment and floor space optimization one step further by teaming with a wave soldering
equipment manufacturer in adapting a comprehensive wave soldering
system capable of both lead and Pb-free wave soldering
The AZ757 is available in a sealed version for automatic wave soldering
and cleaning operations.