Success, I think.
Tacked.
I didn't take pics of the process because that meant repeatedly taking off my gloves.
I tacked, gouged to the center between the tacks, made several passes, let it cool, gouged between the next and last tacks, removing those in the process, filled, repeat. Took about 5 hours, and that was from the time I opened the barn doors, backed the expensive toys out, moved the Ural to the other bay, made sparks and smoke, moved the Ural back, brought the toys back in, and closed the doors. Seth pestered me a few times, too.
Finished. It looks better than in the pic.
Nekkid Ural.
Hopefully, he says, back together by Thursday. I have a new sidecar shaft boot on order, promised for tomorrow. That tore when the two parted company. I need that before I can pair them back together.
In the meantime, while the tank is off, I'll replace the throttle cables. I think those are original.