Drives,
Those Lincoln M/G welders are really cool, I remember my dad having one of them in his shop in the early 60's.
I have seen all kinds of repairs to erase the arc of shame from welding, to brazing, to JB weld and they all looked like poop.
Instead of trying to fill the holes, I just decided to cover them up. I turned the table upside down on a piece of 1/4" steel plate and traced the table on the plate. Then I cut the shape out of the plate for a new steel veneer.
I didn't want to bolt or rivet the veneer to the table so I drilled about 40 1/4" holes in the table (it already had a bunch of holes in so whats a few more). On the under side of the table I used a counter sink to taper all the holes. Then I carefully clamped the plate to the table and starting from the center and working my way out, I laid a real hot plug weld in all the holes filling the counter sunk area. The plug weld is actually in the steel veneer plate, not the cast iron table. When the weld cools, it shrinks up tight and clamps the veneer plate to the table.
Then I turned the table upside down on the mill table and drilled the center hole and milled the slots for the vise hold down bolts using the original hole and slots for a guide.
A little Roloc pad to clean it up and it was done. Then I thought I'd give it a little bling so I did some engine turning on it with a little 3/4" sanding disc.
So I really didn't repair the table, I just covered it up.