Common problem...maybe even more so on a vibrating diesel engine. I welded mine three yrs ago and it's probably stronger than the original. Do good prep and weld wisely-TIG if you can. New ones are pretty cheap...I've recently been hearing a loud clunking noise when I make left turns on bumpy roads. I assumed it was severe bushing wear, but upon inspection, the sway bar bushing bracket was completely broken on the right side. This is the bracket that connects the sway bar to the frame and it is surprisingly light gauge steel.
I took it off and tried to weld it at the broken seam, but it quickly broke again upon some aggressive cornering. If I can't get a new one locally, I may pull it off and do a better weld job on it.
I was just curious if anyone has ever seen one of these brackets snap in half. It broke just above the bushing.