bellhousing crack


high on gas fumes
I'm getting ready to send the trans out to David Husek for rebuild and noticed a past repair done on the bellhousing. Is this a common area to crack and what would cause it? Plans for the car is to take it into the mid or low I hope this will hold up. Thoughts?

Worst case scenario, get an sfi bell housing but like others have mentioned, it looks like a good weld.