Not a joke.
You are welding on a formed tube part and not as thick a wall as a Dana 60 etc.
I have a housing that so eone didn't heed the FSM and they tightened the u bolts too tight and crushed the tube.
I have not measured it but I am sure the housing is not streight
The heat WILL cause the metal to move.
Google it. There are photos showing how far out some housings are.
Projects - Straightening an axle housing - How straight ?
Is this 8 3/4 housing bowed?
First time straightening an 8 3/4 housing!