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.
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-glossary-of-terms
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Blackfox Training Institute, LLC | https://www.blackfox.com/blackfox-to-lead-free-or-not-to-lead-free-that-is-the-question/
. One of the disadvantages of lead free solder is that it is rough and grainy compared to leaded solder. Lead free solder also generally requires tighter temperature regulation on the soldering iron
