I was just wondering why everlast does not make some 220v- 440v welders. These would be much more versatile than 3 phase models. I would say 90% of the industrial welders I have use in my career have been this type of machine. The 440v single phase can still be used in a 3 phase system . You have some models that are single phase and 3 phase. These are ok but the 220v-440v single phase type would cover everything that most would run into.