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80amps is a very big draw. First the main panel needs to have the capability to deliver that load, probably a 200amp panel. Second the sub-panel needs to be fed by large enough conductors to provide 80 amps, most likely a 100amp panel. A 4awg wire would meet the welder requirement, but considering you'll run lighting and other items I would run at least a 1awg wire. You'll need four wire to the sub-panel, red and black hots, white neutral, and a ground.
So, bascially you don;t have enough power there to run any kind of welder except maybe the smallest 120v available. Call an electrician.
John
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1985.5 944 GTS
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