“Cosmetically acceptable solder joints are important but only if they are achieved in a reliable fashion. Wetting issues can be eliminated by employing stronger fluxes, but the resulting ionic contamination can cause failures. And overheating components leads to premature failures. Neither ionic contamination nor overheating can be seen but they can be deadlier than unattractive solder. Anyone can melt solder onto components; very few people do it reliably.”
Written by @jsmith of Electronics Manufacturing Sciences, Inc.
See the full article here: 8 Soldering Tips To Watch Out For