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.
"To compel a man to subsidize with his taxes the propagation of ideas which he disbelieves and abhors is sinful and tyrannical."-- Thomas Jefferson
'08 34' Classic SO, '12 Ram 2500 4X4, 6.7L Cummins.