Blowing holes

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Howdy, I'm fairly new to Mig welding, I own a Lincoln Electric Mig-Pak 140. I've used it on thicker metal but never as thin as I am now. I'm making a bbq smoker. I've cut up a 55 gallon drum to make a smaller drum as a firebox. I've followed the guild lines on the inside of my welders door, the steel is approx 22g thick, it says to set the welder at 2.5 A, my argon/Co2 is set at 35 L/min, what the hell am I doing wrong? I've just started to tack weld and getting blow holes. I'm thinking of putting a thin piece of steel under the joint in hopes it welds together to avoid holes but not sure if that will solve it. Thanx for any and all of the help. CheersLincoln Electric MIG Pak 140 Wire Feed WelderSupport CASAA http://www.casaa.org/Donate_LKWE.html
Reply:22 gauge is pretty difficult. Are you sure about your meter setting? 35 l/min is way too much flow.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:22ga will be quite difficult. You don't mention wire size, I'll assume it's .023 wire. .030/.035 would be too big for this.Your fit up will need to be perfect with no gaps, pieces held together tightly. Joint configuration will make a big deal. But joints will be very tough, while laps would be easier. You can back up the welds with a piece of copper held tight to the back to help support the puddle and act as a heat sink. Also how far you hold the gun from the work will make a difference. With mig, the closer your stick out is, the hotter the machine will weld for a given setting. If you hold the gun back farther it will weld colder. No long beads. Short quick tacks, then move some where else and tack again, eventually coming back and overlaying the tacks to connect all the "dots"..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Yea I've been using 0.35, I thought that was recommended, should I try 0.25?Lincoln Electric MIG Pak 140 Wire Feed WelderSupport CASAA http://www.casaa.org/Donate_LKWE.html
Reply:Ive done some thin metal work on my car and ran into similiar problems, but switching to .023/.025 is  a must. Then just do spot welds like was suggested.
Reply:Awesome thx ppl.. I'll update when I try it out.Lincoln Electric MIG Pak 140 Wire Feed WelderSupport CASAA http://www.casaa.org/Donate_LKWE.html