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Welding Using Car Batteries. Hook them up in a parallel for 12VDC at high current and you can. Before attempting this there are some very important things to understand.
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The only answer I can give is - it depends. Heres the simplest welder you can make. As seen on America Unplugged on the sportsman channel episode 5.
I put two 12 volt car batteries in series to make 24 volts which is just about right to burn 18 inch rods.
With another set of cables I. They are the solid steel rods used to p. Hook them up in a parallel for 12VDC at high current and you can. The whole trouble with using car batteries is that you have no control over the current.
