I'm thinking of expanding my "machine park" (1 arc/tig DC welder in a hobby garage) and I am adverse to buying cheapo brands of Chinese manufacture. I am particularly a Kemppi man, because Kemppi is finnish and I am from Finland, so I like to support local business. But money isn't exactly in plentiful supply so I don't tihnk I'll be looking at any new machines. I'm probably gonna be looking at older used machines and they are more likely to be rectifiers, preferrably 3 phase but maybe single phase will do. That's kinda the reason I am making this thread... I know what a single phase rectifier isn't fun to weld with for arc-welding. I used to have an arc welder like that and it was very choppy and difficult to weld with. I am wondering if the same holds true for mig welding as well, it's quite a different process so perhaps it does not. I don't know... So that's the gist of my question, is there a significant difference between a rectifier mig welder and an inverter one? I know that a 3-phase rectifier is very smooth as an arc welder, because it rectifies all three phases so you don't get the 50hz choppy feel. But I have hardly any experiences with mig welders so it's all new to me. Just wondering if I should discard older single phase mig welders, or if the process is different enough that it doesn't matter.