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100 % argon gas is usually the gas of choice but mixtures like 50/50 argon/helium can be helpful for welding thick sections.Make sure the polarity is connected properly. mig welding aluminum requires reverse polarity. Another way of saying reverse polarity is Direct current electrode positive or DCEP.
There are many factors the effect the quality of MIG welding. This page tries to examine the effect of varying the mixture of Argon and Carbon Dioxide. This is difficult to quantify. Changing the gas mix effects the current and the range of acceptable wire feed. A test was done using 0.039 (1mm) steel. Turns out it was galvanized, so surface had to be ground down to weld.