Bolanmu PCB wave soldering

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The main advantages of wave soldering:
1. High welding quality: wave soldering can ensure the stability and consistency of welding, beautiful weld, high quality, welding strength.
2. High production efficiency: wave soldering speed is fast, can greatly improve the production efficiency, suitable for mass production.
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what is the black material under pcb, between pcb and solder bath?

baiyuwang