Been practicing on some aluminum...

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Been trying to learn how to weld aluminum lately with my old Airco and I think that I'm slowly getting better. All these beads look a little cold to me but I currently only have a 17-Series 150A air-cooled torch. I had the current on the machine set to 180A but I was reading through the manual for my welder and realized that the POT in the foot pedal is supposed to be a 10KOhm where-as I installed a 25KOhm POT when I refurbed the pedal and I think it's effecting the welder's output. The reason I installed a 25K POT was because that's what the old one speced out as but yesterday when I had the side panels off my welder blowing out the dust and setting the high-freq spark gap I noticed that somebody had made an adapter to go from the original rectangular 6-pin Airco connector to a round 6-pin Hobart/L-TEC connector and these welders used different POTs in their pedals. So that POT is something I need to change and see if things work differently. Anyways, here are the pictures of the beads I've been running the last 2 days. Just trying to get as much seat time as I can. These beads are much nicer than what I was doing a couple of weeks ago. Ha!Settings were as follows.Current: 180A on panel controlled with the pedal.Tungsten: Pure on some 2% Lanth on others. Both prepared with a taper with a flattened tip instead of a point.Cup: Flat Stock: #8 Small Gas Lens; Fillet: #6 Small Gas LensTorch: 17-Series Air CooledGas: 15-17CFH ArgonPost-Flow: 12-15sBrad GeorgeCurrent Equipment:AIRCO Heliwelder IV 300Amp Model - Total Awesomeness!Old 120v Hobart Handler MIGVarious grinders, cutting tools, hammers, clamps, ect..."I'm an amateur welder with lots left to learn..."
Reply:Brad GeorgeCurrent Equipment:AIRCO Heliwelder IV 300Amp Model - Total Awesomeness!Old 120v Hobart Handler MIGVarious grinders, cutting tools, hammers, clamps, ect..."I'm an amateur welder with lots left to learn..."
Reply:Very nice. Practice does make perfect.Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li  ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:beads look good but those first sets of pics are not getting very much penetration at all OP.mike
Reply:Yeah, like I said I believe having the wrong POT in my foot pedal is limiting my output. And for some reason if I put the welder in high range the arc becomes very unstable at higher amps on AC and I'm unsure why.Brad GeorgeCurrent Equipment:AIRCO Heliwelder IV 300Amp Model - Total Awesomeness!Old 120v Hobart Handler MIGVarious grinders, cutting tools, hammers, clamps, ect..."I'm an amateur welder with lots left to learn..."