Argon and Aluminium frosting.

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I have a question we opperate a Fronius CMT at work to weld aluminium. From my basic knowlege frosting along the sides of the weld is caused by the AC penetraiting/ cleaning the oxidation layer of the aluminium.  This I understand but what I don't understand is if I increase my argon flow (we use 100% argon) the frosting becomes broader. I cant see the relation between the argon and the frosting?
Reply:Do you know the alloy?  Could be a non-weldable aluminum alloy with magnesium or zinc as a component.  Cover gas contamination? Clear powder coating that was not properly removed?Not really enough information supplied to give a better answer.  Just throwing spaghetti on the wall to see what sticks.
Reply:Its a 6082 Aluminium compesition the frosting is not a problem I was simply curious to why the frosting would increase in amount when the Argon is increased.
Reply:

Originally Posted by BT80

I cant see the relation between the argon and the frosting?