Get a nut that is uncoated or beadblasted/wire brushed clean to remove the coating.
Then you place the nut over the stripped head.
Verify that it has clearance to turn when it is welded onto the stripped head.
Now.......carefully lay a hot bead into the center on the nut, and the stripped head.
You can use a wet rag around the area to help control thermal transfer.
Let it cool down. and test it to see if it holds.
After that...the only things left....live with it, or replace the steering box.
Check to see if you have a steering system rebuilder anywhere around you...may save a few bucks if you replace it.
Here's video that shows what I'm talking about.
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