A spot welder would be a useful device in any tool arsenal. If you’re handy, you can build one on the cheap using an old microwave. Matthew Borgatti can help you out with that using techniques culled (and improved) from other DIY spot welder builds.
The process is thoroughly explained in his project documentation. Files can also be found on Borgatti’s Thingverse page. Naturally, this isn’t a project for beginners.
See the finished spot welder in action after the break…