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  1. #1
    Join Date
    Sep 2013
    Posts
    2

    Default MIG gas regulator setting

    Hello,

    What should the pressure be on a MIG regulator?

    Most regulators come "pre set" to something..
    but nobody says what it should be?

    I'm not talking about flow rate.
    Yes, I do understand the concept of choked flow.

    I can get the proper flow rate with either lower pressure (10 psi)
    or higher pressure (80 psi), but it seems like the higher the pressure,
    the more the first blast of gas when trigger is pulled.
    Is that good, or just wasting gas?

    thanks

  2. #2
    Join Date
    Dec 2006
    Location
    Central Alabama
    Posts
    40

    Default

    Not sure I fully understand and bear in mind that I am not a pro, but I have two gauges on my mig, one for the pressure in the tank (which has no adjustment) and one for the flow rate. The flow rate is in cubic feet per hour and I usually set mine in the range of 18-20 cfh. This is with the trigger pulled.
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  3. #3
    Join Date
    Oct 2009
    Posts
    306

    Default

    30 CFH. You should have a dual gauge reg on the tank one gauge shows bottle pressure and hrs other is your working pressure.
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  4. #4
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    500

    Default

    Jim is not asking about the flow rate. There is flow and pressure. I have a high pressure and low flow fixed regulator to run my air lockers in my jeep. It does .5 cfm at 100psi. Jim wants to know what pressure, in psi, that a regulator flows at a given cfm. I'd have to look but I think my Radnor flow meter is at 50psi output. Not sure though.
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  5. #5
    Join Date
    Sep 2013
    Posts
    2

    Default

    Thanks for your replies....

    Once again, I'm not talking about flow nor CFH.
    On a normal gas regulator, (ie. Acetylene) there are two gauges.
    One for tank pressure, other for line pressure.

    On a Mig regulator, there is tank pressure gauge and a flow meter.
    The line pressure gauge is missing.
    IF that line pressure gauge was there, what should the pressure be?

    I know that because of choked flow, the dynamic pressure
    will be lower when gas is flowing.

    So, if my regulator pressure (not the flow) is adjustable, what should that static/non flowing pressure be?

    thanks again.

  6. #6
    Join Date
    Feb 2013
    Posts
    12

    Default

    Most run 15 to 20
    The main thing is not to panic or get excited
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  7. #7
    Join Date
    Nov 2003
    Posts
    3,212

    Thumbs up

    Here is a link to a simple GMAW gas flow rate chart...

    Flow rates are in CFH... Cubic Feet Per Hour


    http://www.netwelding.com/MIG_Flow_Rate_Chart.pdf

    This should take the mystery out of it...

    ALSO

    Here is a video that may help to clarify things...

    http://www.youtube.com/watch?v=5bAJq_3XJOA

    Unfortunately some of this is sales pitch... but the basics are there and easily understandable..
    Last edited by H80N; 09-27-2013 at 07:18 AM.
    .

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  8. #8
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    578

    Default

    Jim, why would you need this information? Just curious.

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