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  • reverse polarity

    I weld hi freq reverse polarity on aluminum everyday I do a lot of mig on cars and such my new mig machine has reverse polarity what is the purpose of reverse polarity when using a mig on steel?

  • #2
    The reverse polarity is for when you are running flux core wire instead of regular solid wire.
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    • #3
      Ok ive always mig welded on cars and such always solid wire so I didnt know thank you

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      • #4
        Well Reverse polarity is electrode positive, flux core runs in straight polarity, as does most tig work

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        • #5
          Innershield (Gasless) flux core is straight polarity (DC-)

          Outershield (Gas shielded) flux core is reverse polarity (DC+)

          Originally posted by WyoRoy View Post
          The reverse polarity is for when you are running flux core wire instead of regular solid wire.
          Not quite sure where you got that information, but solid wire is also run on reverse polarity.

          The reason the new mig machine has reverse polarity is probably because it has a gas hook-up on it and you can run a solid wire whereas the older model did not, hence the straight polarity used to run gasless flux core.
          Last edited by jpence38; 07-06-2013, 07:55 AM.
          JIM

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          • #6
            Originally posted by wheelman918 View Post
            my new mig machine has reverse polarity
            `Just curious, do you mean it is set up with reverse polarity or it has a polarity switch? What model of mig machine are you talking about?--Meltedmetal

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            • #7
              Originally posted by Meltedmetal View Post
              `Just curious, do you mean it is set up with reverse polarity or it has a polarity switch? What model of mig machine are you talking about?--Meltedmetal
              Just a guess, but it may have two terminal posts that can be switched on the inside where the wire spool goes. That is the way my small machines are set up.
              JIM

              Owner Operator of JNT Mobile Welding & Repair LLC
              Millermatic 350P Aluma Pro
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              Maxstar 150 STL
              Trailblazer 302
              Suitecase 12RC
              Extreme 12VS
              Extreme 8VS
              Spoolmatic 30A
              Miller HF251D-1
              Passport Plus
              Spoolmate 100
              Hypertherm Powermax 45 and 85
              Ingersoll Rand Engine Driven Compressor
              Dake 75 ton H-Frame Press
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              • #8
                Originally posted by jpence38 View Post
                Just a guess, but it may have two terminal posts that can be switched on the inside where the wire spool goes. That is the way my small machines are set up.
                Thanks Jim. I am aware of this and I guess a polarity switch is something that the "product engineer" saw fit to dispense with to save a few dollars on the cost of manufacture. Keeps the price point lower I suppose. I don't have one(small mig) but if I did, I think I might be tempted to put a polarity switch on it just cause I do a wide variety of things in a wide variety of places and usually in a rush. Anyway looks like he's gone fishin' and I've got to go do some pointing. (Not the finger kind, the stone foundation kind). Have a good weekend all.---Meltedmetal

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                • #9
                  Can someone point me in the right direction. I own a 211 and would like to add a polarity switch to the front panel
                  since I'm frequently switching. Thanks
                  .
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                  • #10
                    WHY would you be continously switching from gas to gasless wire???

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                    • #11
                      I use this machine for my flux core wire
                      and. When an aluminum job. Shows up I use the same machine. This happens maybe twice a week. Multiple times a day.
                      I know I need to buy a second machine I just haven't. Made my decision on which one. I wanted a passport plus. But Miller goes and pulls it of the shelf. And I can't get a shop size machine. Because I'm mobile. On sites
                      .
                      Miller Bobcat 225NT onan
                      Millermatic 211
                      Spoolmate 100
                      (Retapped to fit regular mig tips)
                      Work better & less parts to stock.
                      Miller 130xp
                      T/A Dragster 85 (portability 11 pounds)
                      Oxygen/Acetylene torch set 50'
                      2. 4-1/2" grinders
                      1. 9" grinder
                      14" Makita chop saw
                      1/2" Aircat impact gun 900#

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                      • #12
                        Originally posted by wheelman918 View Post
                        I weld hi freq reverse polarity on aluminum everyday I do a lot of mig on cars and such my new mig machine has reverse polarity what is the purpose of reverse polarity when using a mig on steel?
                        Reverse polarity (EP) TIG? Kinda tough on tungsten isn't it?
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                        • #13
                          Originally posted by duaneb55 View Post
                          Reverse polarity (EP) TIG? Kinda tough on tungsten isn't it?
                          Good catch. I can't believe I missed that. Something isn't right in Millerville.
                          JIM

                          Owner Operator of JNT Mobile Welding & Repair LLC
                          Millermatic 350P Aluma Pro
                          Dynasty 200DX
                          Maxstar 150 STL
                          Trailblazer 302
                          Suitecase 12RC
                          Extreme 12VS
                          Extreme 8VS
                          Spoolmatic 30A
                          Miller HF251D-1
                          Passport Plus
                          Spoolmate 100
                          Hypertherm Powermax 45 and 85
                          Ingersoll Rand Engine Driven Compressor
                          Dake 75 ton H-Frame Press
                          JD Squared Model 32 Bender
                          Miller Digital Elite

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                          • #14
                            Originally posted by eecervantes83 View Post
                            I use this machine for my flux core wire
                            and. When an aluminum job. Shows up I use the same machine. This happens maybe twice a week. Multiple times a day.
                            I know I need to buy a second machine I just haven't. Made my decision on which one. I wanted a passport plus. But Miller goes and pulls it of the shelf. And I can't get a shop size machine. Because I'm mobile. On sites
                            Have you tried switching to a gas-shielded flux core wire???
                            JIM

                            Owner Operator of JNT Mobile Welding & Repair LLC
                            Millermatic 350P Aluma Pro
                            Dynasty 200DX
                            Maxstar 150 STL
                            Trailblazer 302
                            Suitecase 12RC
                            Extreme 12VS
                            Extreme 8VS
                            Spoolmatic 30A
                            Miller HF251D-1
                            Passport Plus
                            Spoolmate 100
                            Hypertherm Powermax 45 and 85
                            Ingersoll Rand Engine Driven Compressor
                            Dake 75 ton H-Frame Press
                            JD Squared Model 32 Bender
                            Miller Digital Elite

                            Comment


                            • #15
                              Originally posted by wheelman918 View Post
                              I weld hi freq reverse polarity on aluminum everyday I do a lot of mig on cars and such my new mig machine has reverse polarity what is the purpose of reverse polarity when using a mig on steel?
                              High frequency tig welding on aluminum is generally done with AC weld current, not dc + (reverse) polarity.
                              Someone is a bit confused here.
                              Lincoln Idealarc 250 stick/tig Miller Bluestar 2E Thermal Arc Hefty 2 feeder Thermal Dynamics Cutmaster 52 Torchmate CNC table Ironworker Welder Operating engineer Owner/Operator Devlin Metal Works Custom CNC Plasma Cutting and Welding

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