Technical Library | 2007-08-16 13:34:31.0
While experienced inspectors may be able to determine the aesthetic differences between a lead-free PCB assembly and a tin-lead version, one cannot rely on the "experienced eye". "Less wetting out to the pad edges" (Figure A) and "graininess and lack of shininess of the solder joint" (Figure B) are typical comments about some lead-free solder joints. However, in cases where a Nitrogen atmosphere was present during the reflow of the solder joint (Figure C), there will be little visual differences between the lead free alloys and their tin-lead counterparts.
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. Dull or grainy joints are not a big concern – the grain structure will grow in a joint over time anyway. But having a dull joint is giving this eventuality a “ head start
Blackfox Training Institute, LLC | https://www.blackfox.com/blog/guide-to-a-successful-lead-free-soldering/
. How to prevent potential defects surrounding the use of lead-free solder? Always try to maintain the right tip temperature. When the tip temperature is too high, it can result in grainy joints
