This is how the tool joints are attached to the pipe body to make drill pipe. And the brake isn't used . It just stops when it cools enough to solidify. Noisy too with lots of sparks to start with. Big horse power isn't needed, just a lot of RPM and a large mass chuck to give lots of kinetic energy for the weld.
I did this some years ago to make a collet drawbar. Using a 9" Logan, took a couple of tries to get right. 3rd attempt worked fine, never did come apart. I think I still have it somewhere.
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