Poor Hole-Filling with Pb-Free Wave Soldering?

摘要

When the soldering process is converted to Pb-free, one may often find solder connections where hole filling is not complete. This was not much of a problem when boards were soldered with common SnPb alloys. It sometimes occurred due to incorrect process settings, such as insufficient flux. Now, with Pb-free soldering, these problems seem to be part of the process as they cannot be reduced even with optimal settings.