This is a spot welder I made from a transformer from a microwave oven. It was made by removing the secondary from the transformer and replacing it with two 2 AWG (stranded) wires coiled in parallel. I didn't have access to thicker wire so I used two 2 AWG wires in parallel. It would have been better to use one length of thicker wire. The open circuit voltage is 2V and the operating current is 800 Amps. It is not very powerful but I like how it turned out. It is actually very usable for very light work. The bird cage guard project in the video is really is pushing the limits of this little machine. My welder was made heavily based on the welder that Grant Thompson ("The King of Random" on YouTube) made. I linked his video at the bottom of this post.
I made a little video that shows the first couple of projects that I mad using my welder.
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This is the spot welder design that mine was modeled after. (My bottom arm is fixed.)
Grant Thompson's ("The King of Random") Spot Welder:
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