Simply lead isn't there for a random reason.... it's the best thing they found to reduce the melting point.
Lead-free solder tries to replace lead with other metals, and that of course affects the quality.
.
Lead-free solder tries to replace lead with other metals, and that of course affects the quality.
Wikipedia said:Lead-free solder has a higher Young's modulus than lead-based solder, making it more susceptible when deforming applied. When the PCB on which the electronic components are mounted is subject to bending stress due to warping, the solder joint deteriorates and fractures can appear. This effect is called solder cracking.[12] Another fault is Kirkendall voids which are microscopic cavities in solder. When two different types of metal that are in contact are heated, dispersion occurs (see also Kirkendall effect). Repeated thermal cycling cause the formation of voids which tends to cause solder cracks. Lead-free solder can cause short life cycles of products, as well as planned obsolescence.[12]
.