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.
"Those who expect to reap the blessings of freedom, like men, must undergo the fatigue of supporting it." Thomas Paine
'08 34' Classic SO, '12 Ram 2500 4X4, 6.7L Cummins.