strip of plate with a 90 angle 3" across 1" up. feather cut the side every inch (to make it curve)
weld it.
or.. you could cut a slip through in the arch. bend flat plate around the arch slipping in the cutting you've made. weld it in inside.
cut the excess of your plate from the arch outside leaving half an inch or so then hammer & dolly the lip upover if you can get your arms around. seam it up
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