The technology is changing and honestly I haven't kept up
In my days in power generation often I had to do a piece out of a water wall tube inside the boiler
Its a huge boiler over 100 feet high and at least 40 feet square, maybe even bigger as its been awhile
Welding in a new tube we used grid type machines that were located through out the plant
The thing was id be inside the boiler up on the climber, have a guy below and a guy right outside the boiler
Id set the machine to what I thought was right but if I had to make a adjustment id have to yell to the guy below, you'd in turn yell to the outside man and he'd either walk up a whole lot of flights of stairs or take the elevator to get to the machine to adjust it
The cables went through port holes and the guy would wait to hear from me if the amperage was ok
Just a part of the job that could be a PIA
So seeing that the tube was welded on the inside we'd run 6010 1/8 and finish everything off with 3/32 7018
If I had one of these new inverter machines I could have taken it up with me on the sky climber and ran one single phase 220 volt cord out the post hole and be done with it
Much easier
