My Dana 70HD had the perches welded from the factory with a MIG welder, and I am sure of it, as I took a tour of the factory.
I cut them off and moved them, used a stick welder because that's what I had at the time, no problems.
I have also TIG welded some on someone else's axle, again, no problems.
If using the MIG be sure you have good penetration, and some of the smaller machines may not give it to you?
Grigg
