Here is a homemade spot welder I made. It just connects to a car battery and welds thin steel and tin pretty well. The far right side is where the welding occurs. Just hook one side of the battery to the left side on the longer copper pipe. And hook the other side of the battery to the shorter pipe where there is a gap in the electrical tape. If you make this one, make the pipes shorter, about half the length. There is too much play in mine and that is one thing that I would change.
Take a look at this video. It talks about resistance spot welding and how it works.
http://www.youtube.com/watch?v=AwL1CAg43PU&NR=1
Here are some videos of people using microwave transformers to make spot welders.
http://www.youtube.com/watch?v=Wp7JF2sANsw
http://www.youtube.com/watch?v=PpME0fvmeg8&feature=related
http://www.youtube.com/watch?v=9spgDiU3_nw&NR=1
Just be careful when working on microwave ovens. The main thing is make sure it is unplugged and then short the capacitor out using a screwdriver. Those capacitors are very dangerous.
Richard
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