Hello
Mad Machinist pointed out:
I
Excellent point about the hard facing of the rolls work hardening to the point of getting brittle.

The pipe this one is thinking of using has a wall thickness of about 3/4 inch thick. Hope that by running some beads of hardening rod and cooling as fast as possible will keep the warpage or movement down? Any ideas here?
Have taken a 1 1/8 inch shaft and added metal to one end of the shaft to then machine on a lathe down to 1 1/2 inch to be welded into the pipe with 3/4 inch walls to make a roll. Sounds like the roll is a one shot item?
The jaw crusher plates have two layers of hard facing rod welded on them. Made the plates bow bad. have not flattened yet. Any tips out there on this?