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How to Solder Videos: Why is soldering difficult sometimes?

Step 3Good and bad joint pictures

Good and bad joint pictures

The most important thing to look for is good adhesion or "clinging" between the solder in the surfaces it's attached to. Lead-free solder can appear dull and still be perfectly fine, but typical lead-based solder should be shiny in appearance.

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CuriousInventor.com

Interested in soldering techniques, electronic music instruments, arduino.