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  1. #11

    Default

    my owner's manual, Miller online articles, now the forum

  2. #12
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,838

    Default

    Quote Originally Posted by hitchingrail View Post
    my owner's manual, Miller online articles, now the forum
    What machine do you have?
    Ed Conley
    http://www.screamingbroccoli.net/
    MM252
    MM211
    Passport Plus w/Spool Gun
    TA185
    Miller 125c Plasma 120v
    O/A set
    SO 2020 Bender
    You can call me Bacchus

  3. #13
    Join Date
    May 2010
    Location
    Central CA
    Posts
    781

    Default Correct

    Quote Originally Posted by MMW View Post
    The one gauge tells you tank pressure. You can't change this as it will decrease as the tank empties. A full bottle should be in the 2000 to 2500 range. This will change with temp though. The other gauge or sight tube usually shows cfh which should be set at about 15-20.
    I saw a double gauge today and MMW is correct. One gauge is tank psi and the other is cfm.
    Good Luck,
    Bob

    Edit: should read CFH.
    Last edited by Bob Miller; 04-10-2011 at 04:58 AM. Reason: Should read CFH
    Millermatic 252 w/30A
    Big Blue Air Pak
    Ellis 3000 Band Saw
    Trailblazer 302 Air Pak w/ Wireless Remote
    8-RC
    Dynasty 200 DX
    XMT 350 MPa w/S-74 MPa Plus
    Millermatic 211
    Passport Plus
    Spectrum 625 X-TREME
    Lincoln SA-200 Blue Tint Red Face '63
    2-Lincoln SA-200 Red Face '68
    SA-200 Black Face '59
    SA-200 Green Lite '84
    SA-200 Green Lite '80
    SA-200 Red Face '69
    SA-200 Red Face '66
    SA-200 Green Lite '81
    '70 Black Face Round Barrel

  4. #14
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,838

    Default

    Quote Originally Posted by Bob Miller View Post
    I saw a double gauge today and MMW is correct. One gauge is tank psi and the other is cfm.
    Good Luck,
    Bob
    CF H
    Ed Conley
    http://www.screamingbroccoli.net/
    MM252
    MM211
    Passport Plus w/Spool Gun
    TA185
    Miller 125c Plasma 120v
    O/A set
    SO 2020 Bender
    You can call me Bacchus

  5. #15
    Join Date
    May 2010
    Location
    Central CA
    Posts
    781

    Default Oops

    My Bad
    Good Luck,
    Bob

    Thanks, Ed
    Last edited by Bob Miller; 04-10-2011 at 05:00 AM.
    Millermatic 252 w/30A
    Big Blue Air Pak
    Ellis 3000 Band Saw
    Trailblazer 302 Air Pak w/ Wireless Remote
    8-RC
    Dynasty 200 DX
    XMT 350 MPa w/S-74 MPa Plus
    Millermatic 211
    Passport Plus
    Spectrum 625 X-TREME
    Lincoln SA-200 Blue Tint Red Face '63
    2-Lincoln SA-200 Red Face '68
    SA-200 Black Face '59
    SA-200 Green Lite '84
    SA-200 Green Lite '80
    SA-200 Red Face '69
    SA-200 Red Face '66
    SA-200 Green Lite '81
    '70 Black Face Round Barrel

  6. #16

    Default

    My machine is a Millermatic 252 with double gauge regulator

  7. #17
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,838

    Default

    Quote Originally Posted by hitchingrail View Post
    My machine is a Millermatic 252 with double gauge regulator
    Section 4.10 in your manual
    Installing Gas Supply

    "Typical flow rate is 20 cfh (cubic
    feet per hour). Check wire
    manufacturer’s recommended
    flow rate. "
    Ed Conley
    http://www.screamingbroccoli.net/
    MM252
    MM211
    Passport Plus w/Spool Gun
    TA185
    Miller 125c Plasma 120v
    O/A set
    SO 2020 Bender
    You can call me Bacchus

  8. #18

    Default

    Thanks a bunch.
    I guess I missed it!

  9. #19
    Join Date
    Aug 2012
    Posts
    3

    Default Some Good, Some Not So Good Comments!

    We get many questions about setting MIG gas pressure. Unlike with oxyfuel welding with MIG (or TIG) “flow” is set NOT pressure. Here is why:
    Having been in the welding business for over 40 years and having managed an R&D lab for a major industrial gas company, setting the proper gas “flow” is not well documented. Even the 6 volumes of American Welding Society Handbooks with over 4000 pages have little useful information!
    Having spent the last 12 years helping folks save wasted shielding gas, we have made hundreds of pressure measurements in fabrication shops (and home shops as well-my own!)
    There is actually a pressure you could set if you used a true pressure gauge, but don't use that approach, it will result in significant flow variations! The confusion occurs because many welders use a device that does in fact adjust pressure, it is called a regulator/flowgauge. It has two gauges, one measures cylinder pressure the other is labeled (or should be) CFH for Cubic Feet per Hour, which is flow. That device sets pressure above a very small orifice, usually 0.025 to 0.030 in diameter. That sets the flow. It is a very consistent and accurate way to set flow because it is a “critical orifice” and the flow in the orifice will reach the speed of sound! It cannot exceed that flow rate. (That is why you see lightening before you hear thunder!) Flow will remain the same even when restrictions occur in the system (like bent hoses, spatter in the nozzle, and gas diffuser, the use of a TIG gas lense, etc.)
    Whether you are using a regulator/flowmeter (one with a flowtube and ball) or the two gauge device, if you’re using typical MIG flow rates, from our field measurements the pressure in the gas delivery hose, when welding, will vary from 3 to 7 psi. Don’t try to set that low pressure because the flow will vary when you bend a gun cable, spatter builds etc. The pressure above the needle valve or small orifice must be above 25 psi to have what is called “automatic flow compensation.” Quality flow control systems have been built with this feature since MIG and TIG processes were introduced in the 1940's and '50's!
    We have a free flow chart which gives suggestions and the reasons for setting minimum and maximum flows depending on nozzle size. Check it out:
    http://www.netwelding.com/MIG_Flow%20Rate-Chart.htm
    Our web site (as well as an article we wrote for AWS Welding journal) shows what happens when a low pressure “Gas Guard” device was tested. Flow varied by over 35% because it used 9 psi, not 25 psi above an orifice. That reduced starting gas surge but caused other, less obvious problems! Be sure you use a quality flowmeter with a minimum pressure of 25 psi, which includes all products sold by Miller, Smith, Victor and ESAB and most we have found coming from overseas.
    Last edited by Jerry U; 07-24-2014 at 06:41 AM. Reason: Answering recent "setting pressure" questions

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