should i be concerned?

doesn't look like it failed from decomposition (rust) .....

I would remove the torsion bar, clean off the surface rust....grind off the birdshit weld (looks like one of mine)....and re-weld the area, preferably by someone that knows how to weld (if you don't)....do both sides ,pass and driver while you're at it.

she's save-able....just looks like the "new guy" might of welded that at the factory....seen some dandy's...God Bless the UAW (hope that didn't offend)

Good luck,
Denny