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If the metal is still in good shape you can lightly grind or sand the paint off. The spot welds will show as circular depressions.
If the metal is rusty I ussually cut next to the lap joint on the scrap side. Get enough of the rusty metal out of the way so I can pry the joint open to find the spot welds. Some will pop or I can drill them with a spot weld cutter. Tougher ones I cut on both sides and keep prying, popping & cutting til I get to the end. Then go back and grind off the tough ones.
Hope this helps. Don
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