Maker and Youtuber Carl Bugeja is hardly at a loss for brilliant ideas, how a look at his homepage proves: Jumping circuit boards or motors made of conductor tracks are just two examples. The creative use of his circuit board layout program gave him the following idea: instead of another ground layer, he put a resistance heater in one of the middle copper layers of a multi-layer circuit board, consisting of a single long, meandering conductor track. A strong current can be applied to the separately routed connections.
The power is sufficient to heat the entire circuit board, including the solder paste and attached components, above the liquidus temperature of the tin alloy. A little tact is required here so that no “burn blisters” form due to local overheating in the circuit board.
After the “soldering current” is switched off, the circuit board cools down and is completely soldered, as the author proves in his video. After the soldering process, you can file off the heating cable connections, they are no longer needed.
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