I have a #3 Argon Bottle from Airgas. I have a 200DX and I have used it twice. The first time a month back when I first got it, I played around running a few beads. Today I used to to weld 2 small 3" angle clips on to an 1-1/2" tubing, and now my bottle is out of gas. I may have welded 30-45min tops. Am I using too much gas? I have not checked for leaks because I was out of gas before I realized how quickly the bottle was empty. I should have checked the bottle when I got home to make sure I had a full bottle.