Definitely building one of these this summer. I just wish I'd scavanged my old microwave before we got rid of it.
A fine-spot welder is one of the few equipment where building yourself is cheaper than buying. Description from avdweb.nl. I searched for this on bing.com/images
Homemade Machine Tools | How to Build a Spot Welder, Workshop Tool Plans, IMMEDIATE DOWNLOAD
Transform an old microwave oven into a brand new spot welder!
DIY spot-welder Uses microwave oven transformer. 230 VAC mains in, 3 turn out.
How to Make a Spot Welder – For Cheap
Long-time Maker Matthew Borgatti recently completed work on a homemade spot welder, built from a scrapped microwave and a few other parts.
Spot Welder - Homemade spot welder powered by a surplus microwave oven transformer. Constructed from Delrin, acrylic, PLA, copper, and hardware.
Attach electrodes to jaws
DIY Spot Welder_6