Speaking of gas cylinders, you’ll need a new one. You can’t weld aluminum with the standard 25/75 percent CO2/Argon steel mix gas. You’ll need 100-percent Argon. We bought a 60 cubic foot cylinder at our local welding supply shop for $145. Filling it with Argon was an additional $80, which is just about what it costs to fill our 125 cubic foot steel mix cylinder. Nobody said working in aluminum was cheap!