One thing is if the welder is equipped with PFC. power factor correction. Basically a couple capacitors that compensate for the inrush current that takes place when you strike the arc or get a little too close as you are welding. In the old days (60s) power companies would charge extra if you...
Lots of good used a/c, d/c machines out there with power factor correction and other factory designed filters that are very smooth. I still have my Lincoln TIG/Stick A/C, D/C 300 amp 1982 I bought new.
I have two old Lincoln pieces I bought new. 300/300 stick/tig and an Ln25. Both are working fine. I did 350’ of bead this year with them. I also replaced the blue in the picture with an Esab.
I started doing cylinders in the late 60s, I break the gland nut loose while they are on the machine. I wrap the rod with a split plastic sleeve in case I have to do any hammering, or anything slips. The rod end nut I use big impact wrench.