You can just do a bottle exchange. I'm not sure if you can just buy your own bottle and have it refilled or not. I don't do much welding away from work.

I had Welding during my Jr and Sr yrs in HS. A vocational school.

I could kick ass on TIG, welding stainless.

Tig welding is with a pointed Tungsten rod. It doesn't come in contact with the workpiece.

I was good with the Oxy-Acetylene welding, too.

Aced that class both years.

My sr yr we got a new wire feed that didn't require Argon.

It was a centered-cored flux. Heavier gauged wire. That was cool as shit. It burned very hot with brighter than usual arc.

Damn, I forgot how much I enjoyed that class.