Ya I have cut and welded the inner tie rods before.
I used to cut out what I needed to then find a piece of pipe
a little bigger around then the tie rod so the cut tie rod could fit inside it.
I would cut a piece about 3 inches long out of the pipe and slide it on one side of the
inner tie rod where it had been cut. Then I would weld the tie rod together then grind the weld down smooth. Then slide the pipe/sleve over and center it over your weld.
then weld that on both ends all the way around. Like 33 said have a good welder to make strong welds.
Kurt