A fine spot welder is one of the few tools that you can build on your own in a cheap way, without the need of buying it. Of course, there are many ways of playing DIY spot welder but, this one has some unique features.
First of all, this spot welder was not build to be portable but rather with a more stable basis. After they make the metallic frame with stable basis to support it, they also make a few holes on it, so to screw it on the spot where it will be located.
Check it out!