Theoretically, it should be possible to control an image-stabilizing electronic switch with a manual microswitch (a simple circuit shaped by the switch circuit), and then use this image-stabilizing electronic switch to control the manual welding buttons of two 3 15A welding machines at the same time. In order to ensure the ideal welding effect, it is suggested to use semiconductor electronic switches with good switch synchronization performance, such as solid-state relay, thyristor and vmosfet, to replace the manual welding button of the original welder. Mechanical switches with contacts, such as ordinary relays (with action delay of hundreds of milliseconds) cannot be used to ensure welding current synchronization (simultaneous on or off).

The theoretical basis is that the welding output of modern welding machine has current and voltage sampling circuits, which constitute a closed-loop feedback control circuit. Because the welding output of each welder and the input 220V or 380V power supply are isolated from each other through transformers, the welding outputs of the two welders are connected in parallel with the same polarity, and there will be no voltage difference between them. If there is no voltage difference, there will be no current, so it will not affect the normal work of the current and voltage sampling circuits of the two welding machines.

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