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  • CO2 Regulator

    I was looking a Miller Series 30 CO2 regulator. The low pressure side has PSI and bar settings. How do you set this gauge for MIG welding? IS 20 PSI the same 20 SCFH?
    Hobart beta-mig 2510 Mig welder
    Victor OA Welding/Cutting Rig
    Century 295 amp Stick welder bought 30+ years ago

  • #2
    Might want to look at this one, says it will register 10-50 SCFH ... Read specifications...

    https://www.mahanyweld.com/products/...ional-6ft-hose

    Dale
    "Fear The Government That Wants To Take Your Guns" - Thomas Jefferson..

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    • #3
      Originally posted by coxhaus View Post
      I was looking a Miller Series 30 CO2 regulator. The low pressure side has PSI and bar settings. How do you set this gauge for MIG welding? IS 20 PSI the same 20 SCFH?
      One way is by the appearance of the weld. Another is arc characteristics. A third would be stick the end of the gun in a bucket of water squeeze the trigger and watch for bubbles, increase till you see a suitable stream of bubbles?
      No. Not the same.

      https://weldtalk.hobartwelders.com/f...ert-psi-to-cfm

      I'm just a wealth of internet knowledge.

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      • #4
        Originally posted by oldguyfrom56 View Post

        One way is by the appearance of the weld. Another is arc characteristics. A third would be stick the end of the gun in a bucket of water squeeze the trigger and watch for bubbles, increase till you see a suitable stream of bubbles?
        No. Not the same.

        https://weldtalk.hobartwelders.com/f...ert-psi-to-cfm

        I'm just a wealth of internet knowledge.
        And a master of providing unneeded information, since as Dale pointed out, conversion is not necessary.

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        • #5
          Originally posted by Dale M. View Post
          Might want to look at this one, says it will register 10-50 SCFH ... Read specifications...

          https://www.mahanyweld.com/products/...ional-6ft-hose

          Dale
          "And a master of providing unneeded information, since as Dale pointed out, conversion is not necessary. "

          Some do some don't, Some will and some won't? You might try reading what's been typed?

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          • #6
            To answer the question "IS 20 PSI the same 20 SCFH?" NO - 20 PSI is a unit of Pressure -- 20 Pounds per Square Inch as in the level you fill a tire to. 20 SCFH is a unit of Volume Flow as in how many buckets can be filled with a garden hose in a period of time. -- 20 SCFH is Standard Cubic Feet Per Hour. So if you had a box that was 1 foot X 1 foot X 1 foot you could fill that 20 times in one hour at atmospheric pressure, or basically zero / no pressure. The gun in the water is a good method. If you want to be more accurate -- a 15 inch party balloon holds about 1 cubic foot of gas. You want 20 SCFH then since this in Hours take 60 minutes and divide by 20 which gives you 3. It should take about 3 minutes to fill the balloon. Each balloon is 1 cubic foot - 3 minutes to fill -- fill 20 balloon in an hour -- 20 cubic feet in hour. Start the regulator a 1 PSI and work up from there. I think if you set the regulator to 20 PSI and try to fill the balloon it will fill very fast. I think it goes without saying in any method used the wire should be disabled. To some degree one cant use to much gas, unless it a huge amount, but it get expensive, too little gas and your weld is messed up. So more is better....

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            • #7
              Just get a "flow" regulator and forget all the BS about converting pressure to volume through a orifice when we don't really know what is actual pressure (gauge) and what actual diameter of orifice is...



              Style as above but with proper "gas" type you prefer... Always though this was better then any gauge made to measure PSIG with dial recalibrated (converted) to SCFH (volume)... NOTE: this particular regulator seems to be a fixed pressure (50 PSI) but adjustable volume....

              Dale
              Last edited by Dale M.; 12-18-2018, 10:51 PM.
              "Fear The Government That Wants To Take Your Guns" - Thomas Jefferson..

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              • #8
                Just remember that if you are going to use CO2, make sure the regulator is marked for it. CO2 will freeze regulators that weren't designed for it. A flowmeter is still a regulator, calibrated or measured differently.

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