Hobart 140 and aluminum 6063 HEEELLPP!!!!!!!

First try at aluminum 6063 with hobart 140 mig running ER5356 ally wire in .030" at highest amp and fastest wire feed speed under 75%/25% Ar/CO2.

Was digging trenches and cant seem to establish a weld pool at least one I can see. Early trials produced trenches with little balls of aluminum filling them, worked with it until I can get a continuous bead that seems really tall and is blackish in color with a pitted looking surface. And I am having the occasional expected bird nests pushing the aluminum, but not too bad really. These weldments look like 40 miles of hammered wolf crap and I am running out of options. Im having hell with this application any advice is welcome that might adress the black pitted color of these weld beads I am getting. Trying to put two pieces of channel flat side to flat side .125" thick 6063 Ally.

Cleaned with SS brush and rubbing alcohol, but the dark color seems to be unavoidable with my current lack of skill and knowledge.

Love this site by the way- thanks for sharing the knowledge, its great....


-------------------------------------------------

here is your problem...

you are using 75/25 and what you need is pure argon.

i will bet that once you make that change, you will be able to dial it in pretty quick