At about 9:35 in the video, you can get a pretty good glimpse of the tool he's using to power the carbide burr. You guys recognize the tool? It sure has a sweet sound to it. Sounds similar to a dentist drill. Super smooth.
Looks kinda like this but I am probably wrong
Husky H4230C only black with red I could find. Even has the same white ring. But model numbers can change. And didn't look into who the OEM is.
Definitely that ^ They have had the same or similar design for a few years now...
There a half way decent grinder... no serious complaints... we have 2 new ones and 1 older...
all with lots of hours... I often used similar carbide burrs in them as well...
You sure the sound wasn't just the Video speeding up at 2x or 4x ??? Makes lousy air tool look turbo charge and super cool... Probably he have that snap on as well... but pretty sure that is a sound effect you are hearing...
The camera capture of the liquid metal coming off the end of the filler rod was excellent too. That's got to be the best weld puddle footage I've ever seen.