aluminum pipe test help with purge , never purge tested

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I have to take an aluminum pipe test , 2" sch.40 , we never purge and can't get good answers. How much gap , the bevel or land , how much argon , how long , what should I put my freq. Up to 150 or like 300 . My amps are 165 with less than 3/332 gap looks OK but can't get any help or answers except what I see on my phone so if anyone knows how to do this big time , I got your back on the next one , help.
Reply:Hmmmmm the freq. sounds kinda high to me ( I hardly ever go above 120)  But I'm no pipeline welder either...  Miller Dynasty 350Twenty Six HammersThree Crow BarsBig Rock
Reply:what kinda machine are you using bud?Millermatic 211Miller Syncrowave 350lx with cooler and tigrunner Thermal Dynamics cutmaster 811955 National Cylinder Gas O/A setup with original patina
Reply:Miller dynasty 350 with argon & argon purge , no tape ? I can weld the **** out of alum. Pipe on bench all day long with no purge & small gap & get pen. Little lumpy in spots , I don't think that's what they want on test its visual & x ray
Reply:I don't think you need the argon purge. Are you doing multipass?If it were me and I am not, I would double bevel within 1/32 of the root. Use 75argon/25/helium mix at 22cfh and #8 cup, gas lens if possible. Strike an arc on the rod, addl the rod and drive it into the root of the bevel for penetration to the ID. Continue adding rod and pushing it thru the seam until the root pass is finished. Run a wash over the root pass without walking the cup, but if that is the only way you know, well good luck on that. What I feel is that the notchy profile to the inside is due to keyholeing the root pass, and punching thru with the rod end. Drive your bead thru the seam and it will be smooth. You will also get adequate base metal dilution I think.Is this of an value?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:Twas me I would set freq to 100, and amps to 350 and pump that pedal half way. Drive that puddle to the interior with more pedal. Decrease amps to for happy foot position.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:Thanks for the tips , & I'll pass it on but I wish someone who took a similer test could help , I guess the 6 g purge would satisfied pipe & plate from what I hear , but they want to kill two birds in one shot but I have no bullets right now, the gap  , the land , purge , how t9 close the root at the end is the hard part I think