I don't know for sure, but it looks beyond repair to me.
It would be a simple matter to grind those welds off, and then install a new jack. That's what I'd do, and it wouldn't take a welder 30 minutes to do the job if you don't have the capabilities.
“Never argue with stupid people, they will drag you down to their level and then beat you with experience.” ― Mark Twain
'08 34' Classic SO, '12 Ram 2500 4X4, 6.7L Cummins.