Are you planning on replacing the secondary of the microwave oven transformer with one or two turns of heavy wire? I don't see how the MOT as-is would be very useful for spot welding. Sean On Tue, Jul 30, 2013 at 5:35 PM, veegee wrote: > > This is what I was referring to: > > https://www.youtube.com/watch?v=3DsjH8I1oKNMY > > > > I wasn't suggesting a car battery be used for welding battery tabs but > > advising the poster about > > how a car battery welding setup is powerful enough to weld steel. > > I would compare it to using a pneumatic hammer to push in a thumbtack. > > Mark > > Yeah, what he's doing is arc welding. You can do it with less than 50A. > > What I'm doing is spot welding and I'd prefer to do it with a current in > the order of 100s-1000+A for a few milliseconds at most. A car battery > would be great for this. > > But I already found a 1.5kW microwave oven transformer and this is going > to be a lot easier to control. 20A TRIACs or solid state relays are > readily available near me and I'll be able to switch the primary easily. > No expensive power MOSFETs or capacitors required. > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .