Who knows how this will last, but IPC (a trade organization that publishes solder and electronics standards) has demos of thousands of dollars of all their training material available. This includes picture books of good and bad joints for both lead and lead-free solder (dull and grainy OK for lead-free!) as well as low-res versions of their DVDs, which cover everything from hand soldering techniques, to ESD safety and even PCB manufacturing. The through-hole and SMT picture booksare great references, in particular. The DVDs have great up-close video (and cheesy music). These standards were the primary source for our soldering guides and videos.
Solder Joint Defect Picture Guide (+ SMT)
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