Setting the gas flow rate on my MIG welder has always been a bit of a mystery. The manual is a bit confusing and lacks a set it at this setting suggestion. After some research and trial and error on the welder I have finally found some settings that work for most welding.
MIG Gas Flow rates:
Minimum 18 CFH
Normal 22-27 CFH
Maximum 40 CFH
Also, a voltage of 19 to 23 volts works for most things. Lower on thinner metal or to build up and higher on thicker stuff to get more penetration.