I would have to see it before I would make that call. It would require two things to be repairable:

It would have to still be such that it is dimensionally sound, and it would have to have some solid areas in the right locations to weld reinforcement to. You would never want to try welding it up without welding reinforcement material in a key location.

Actually a third criteria would be the material thickness that one would be starting with. I've welded up plenty of things over the years, but not too much patching on automotive suspension members. Under certain circumstances it can be done.

Welding is like painting, a big portion of the job is in the preparation.