Like I said, that was a successful exercise in engineering, that failed the real world test. The weld size and metal thickness combination passed the stress tests required, and the designed obsolesence to boot.
I've always been surprised at how minimally designed these welds areas are. Senior engineering project junk for sure - although it would get the A+ for the math.
The inner fenders are welded in. It would be much cheaper, and result in a better job, IMHO, to cut out the nut and weld a new one...