deafman;

I checked the specs directly from the miller site
http://www.millerwelds.com/products/mig/product.php?model=M00218

On the 211,212,252 and all say 3/8 max on aluminum??

Doesn't make much sense to me! What am I missing?

I realize duty cycle is much better on 212,252 but I don't do production work so really don't care