Hackaday reader [David] was looking for a cheap and easy way to spot weld copper tabs together. As he notes in ... to his electrodes using heavy gauge wire. The graphite-tipped electrodes were ...

[manekinen] came up with a really great solution to the problem of welding together sheet metal. It’s a very easy to build spot welder perfect ... turns of 35mm ² wire (about 2 AWG).