I seem to recall having seen two or more welders working on the same structure at the same time. Was that for real? Is that OK and normal?If its ok, could I run different welders of different sizes and source voltage at the same time? I've actually go three wire feed welders. An old Harbor Freight blue box which I have not used in years, a Lincoln ProCore 120V I actually use all the time due to its small size and ease of portability, and a Miller 212 (not autoset) I originally bought for aluminum welding, but lately have been using more often for steel due to its decent duty cycle. When I was putting together my welding table frame during the weld out a couple times I thought it would have been nice for my son to burn wire with the 212 while I burned wire with the ProCore.