Epoxy?
I recently butt welded SC flares on my car. The reason I did it that way was to cut down on overlapping metal (flange) that might possible trap moisture causing rust. The epoxy might just work well but I would be sure to "bed" the entire flange with epoxy, similar to the way wood boat carpenters "bed" wood to gether to keep out moisture.
The air cutoff tool (disk type) is very good to cut the radius of the flare.
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