If you don't weld it up, then you cannot swivel the head again, can you? The Tslot bolts must have a flat bearing to tighten against.
Don't be scared. UTP 85FN welding rods make short work of welding up lots of cast iron goodies. That part of the casting is likely quite sound, since it was near the outside of the casting.
In that location, the cast is not too liable to be oil-soaked, which is what really makes welding difficult. Preheat the weld zone to 500 degrees or so.
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