Bearing retainer problem

I know you have to weld a bead around the base to reniforce it. I have one laying around but for the life of me I can't figure why mine broke from just sitting on the rack and rotating the crank
I had to replace mine also, it was cracked. I think Ihad to shell out $80 bux. I would never weld around base for reinforcement. It would likely weaken it right above the weld. bell should be checked for concentricity, something I did`nt do. I think this is chrysler engineering weak link.