MIG gas pressure setting

  1. John_G Member

    Posts: 5
    BC, Canada
    I am TOTALLY new to MIG gas welding. Just got the machine converted yesterday but nowhere in the instructions do they say what to set the gas pressure at. The gas is argon/co2. Could someone give me the starting point and tips for adjusting.

    Thanks.
  2. zardoz

    zardoz Old school Socialist

    Posts: 2,213
    Chetser, UK
    i set my flow rate at about 8 to 10 litres per minute, is that what you mean ? Do you have metric in Canada or is it imperial measurements?
  3. John_G Member

    Posts: 5
    BC, Canada
    Thanks. It is in Litres per minute. That will get me started. Any tips as to adjusting once I start welding? How do I know if I need more or less L/min?

    John G.
  4. zardoz

    zardoz Old school Socialist

    Posts: 2,213
    Chetser, UK
    you wont need more unless you are in a breeze or draught, and then its better to protect your weld metal with screens. Because upping the gas will only help to a small extent. There are some pics somewhere on the site of welds which obviously need more gas as they are covered in thick brown deposits. Not to e confused with the thinner brown discolouration that sometimes happens on a weld. I know its a bit confusing, but if you do a weld or three and post the pics here we can help you a lot easier.
    Good luck.
  5. John_G Member

    Posts: 5
    BC, Canada
    1st welds and a few pictures

    Here are 3 photos. One is the 1st practice beads; the other two are welded cracks on a pieces of sheet metal (tractor fender) 0.038" thickness; Lincoln L100 welder with voltage at A, wire feed at 2.5, and gas at 9 L/min. Practice beads were on metal cleaned with wire wheel; sheet metal was cleaned using a sandblaster. I noticed that when welding the sheetmetal there was a lot of popping sounds (like popcorn full blast) rather than sizzling like frying bacon and eggs.
    • DSC01465.jpg
    • DSC01466.jpg
    • DSC01468.jpg
  6. arkangel06

    arkangel06 Senior Member

    the first picture looks good i think the rest would be wire speed and just keeping stady watching the pool
  7. John_G Member

    Posts: 5
    BC, Canada
    Thanks for the feedback!
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