Cited as a reference
PC Board Assembly - Wave Soldering Machine
Why people recommend it
Footage of a wave soldering line, used to illustrate how through-hole boards are mass soldered by passing over molten solder.
Watch for: process footage rather than a how-to
In their words
This is a somewhat archaic method where the entire bottom of the board is drawn along a flowing pool of solder:
user2208569 on electronics.stackexchange.com, Sept 2017. CC BY-SA.
