Welding gasses ???

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My equipment purchase frenzy is finally near the end (for now)  I now have my Dynasty 200DX/Coolmate 4, Millermatic 350P/XR-AlumaPro/Bernard Q300 and Hypertherm 45.  I am only a hobbyist working at home and other than building tools, carts, fences/gates and working on my car restorations, I really don't have specific needs, just want to be prepared.  I know my reasonable selection of gasses would be Argon, C25 and 92/8.  Helium is another consideration.  I currently have: 2 Argon 250cf & 300cf, Helium 300cf, C25 122cf, Oxygen 250cf and acetylene WC...I have thought of refill/exchanges to reconfigure my inert inventory to include:Argon - 300cfC25 - 300cf92/8 - 250cf or 300cfHelium - 122cf or 250cfWhat are some recommendations of gasses and sizes to have on hand or different options ???GlenMiller Dynasty 200DX - Millermatic 350P - Hypertherm Powermax 45Want to sell!! - Hobart Handler 150
Reply:Maybe add a mix of Ar75/He25. Much cheaper and more useful than pure helium. Can be used both on your Dynasty and Millermatic when welding alum for more grunt.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:To me it seems like your well prepared, maybe get a y valve and mix the helium and argon yourself?
Reply:Slight change in inventory, the so called 300cf Argon I was getting actually turned out to be 300cf 75/25...  This could be a good thing, it's full and I was thinking I wanted a 300cf 75/25.I have a mixing regulator for Ar/CO2/He, but will have to test it to see if it works.  With that I could mix everything if wanted or remove the CO2 section and just do Ar/He....  I'm thinking I might only need to exchange my 122cf C25 for a 122cf He and that may be more He than I will ever need.Another decision is to stay with and/or increase all to 300cf or just trade down to 250cf....  It could be worth it to me to see if I can exchange an empty 300 for a full 250 at no cost???GlenMiller Dynasty 200DX - Millermatic 350P - Hypertherm Powermax 45Want to sell!! - Hobart Handler 150