Bunnie investigates! And other readers chime in with their experience with ripples found on PCBs.
So here’s my quandary: are the ripples intentional (for example, an attempt to increase current capacity by selectively thickening fat traces with a solder coating), or accidental (perhaps microscopic flaws in the soldermask allowing molten metal to seep under the soldermask during wave soldering)?
TL;DR check out this video for one explanation.
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