I’m not sure it’s so much the bead draws the race in as much as the bore the race is in doesn’t heat up, so the race can’t expand when heated, so it gets fatter, then shrinks when it cools.
Either way, sounds like it would work.
Well, the weld is molten when it goes on, and shrinks as it cools. It’s attached to the face of the bearing race, so that goes along for the ride.