Stripped Stud Removal

I wanted to use an old stock cylinder I had, and when I pulled it out of my box today I found a stripped stud stuck firmly in place in the exhaust. I tried threading a nut on, and it was too far gone to hold any threads. The vice grips wouldn't hang on tight enough, although I did only try needle nose, and usually the regular version lock a bit more securely. So I pulled out my welder, pushed the nut on as far as it would go, and just ran a nice little bead inside the nut, welding it to the stud, then out it turned. It feels good to have a welder in my arsenal again.