It's not high voltage, that's the point. I suggest looking for videos [1] on welding steel with a 12v car battery to see how fast metal can heat up with enough

It's not high voltage, that's the point. I suggest looking for videos [1] on welding steel with a 12v car battery to see how fast metal can heat up with enough current behind it. [1] eg. https://m.youtube.com/watch?v=2TtwrqIDnxg https://m.youtube.com/watch?v=2TtwrqIDnxg