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I've done weld on in shipyards, but on ships with much heavier steel than yachts. You need to be careful with too much continuous heat. Probably some form of skip welding to keep the plating from distorting. After welding, the beads were sand blasted and painted like the other steel. I don't remember hearing or seeing any corrosion problems. That was a long time ago and we have better paint now.
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