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Does a MIG machine for alu have DC/AC switch?

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  • Does a MIG machine for alu have DC/AC switch?

    I have a good pro grade TIG welder but it does not allow me to use one of my hands, lol, so beginning to think of buying a MIG machine for aluminum. Most of the ads I watched so far on MIG machines on the net seem they do not show if they run DC, either with AC current. Some semi-pros say they can do aluminum MIG with their machine but still I do not know if they can use AC mode for alu. I know welding alu requires removing aluminum oxide from the surface of the spot we aim to weld, by loading negative polarity for parent material, and positive for tungsten, whereas in MIG the wire needs to be negative when it melts.

    So my question is;
    Are there MIG machines that have DC/AC switching?
    Thanks in ahead.

    Oxy-A (Koike, Sakaguchi)
    HITACHI Inverter Pair 300GP(AC/DC TIG)

  • #2
    NO
    A multi-purpose machine may have AC for CC welding but Mig is DC for CV welding.
    I have know idea if it is actually possible to do or not, but I'm sure it would be really noisy if you could get the arc to carry.
    Last edited by FusionKing; 01-19-2018, 06:15 AM.

    www.facebook.com/outbackaluminumwelding
    Miller Dynasty 700...OH YEA BABY!!
    MM 350P...PULSE SPRAYIN' MONSTER
    Miller Dynasty 280 with AC independent expansion card
    Miller Dynasty 200 DX "Blue Lightning"

    Miller Bobcat 225 NT (what I began my present Biz with!)
    Miller 30-A Spoolgun
    Miller WC-115-A
    Miller Spectrum 300
    Miller 225 Thunderbolt (my first machine bought new 1980)
    Miller Digital Elite Titanium 9400

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    • #3
      Thanks FusionKing , your tip sound right, watched Utube and this guy says he uses "electrode positive" for MIG; Click image for larger version

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      but I do not know the reason why???
      Oxy-A (Koike, Sakaguchi)
      HITACHI Inverter Pair 300GP(AC/DC TIG)

      Comment


      • #4
        Aluminum MIG is DCEP, since EP both removes the oxide layer and melts the consumable electrode, otherwise known as the filler wire.
        HTP Invertig221 D.V. Water-cooled
        HTP Pro Pulse 300 MIG
        HTP Pro Pulse 200 MIG x2
        HTP Pro Pulse 220 MTS
        HTP Inverarc 200 TLP water cooled
        HTP Microcut 875SC

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        • #5
          All mig is dc. Ferrous metals or aluminium.
          Lincoln Idealarc 250
          Miller Bobcat 250
          Thermal Arc Hefty 2 feeder
          Thermal Dynamics Cutmaster 52
          Torchmate CNC table

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          • #6
            Friend of a friend bought a cheap-o mig welder...from northern tool I think...anyway, guy couldn't lay a useful bead with flux core to save his life. I told him I swap the polarity and his world will be happy again. He ever so cleverly informed me that I was wrong and that the problem was that his mig welder was an AC only mig welder and he was using DC mig wire. True story.

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            • #7
              Originally posted by ryanjones2150 View Post
              Friend of a friend bought a cheap-o mig welder...from northern tool I think...anyway, guy couldn't lay a useful bead with flux core to save his life. I told him I swap the polarity and his world will be happy again. He ever so cleverly informed me that I was wrong and that the problem was that his mig welder was an AC only mig welder and he was using DC mig wire. True story.
              Man do we ever need more smilies on here

              www.facebook.com/outbackaluminumwelding
              Miller Dynasty 700...OH YEA BABY!!
              MM 350P...PULSE SPRAYIN' MONSTER
              Miller Dynasty 280 with AC independent expansion card
              Miller Dynasty 200 DX "Blue Lightning"

              Miller Bobcat 225 NT (what I began my present Biz with!)
              Miller 30-A Spoolgun
              Miller WC-115-A
              Miller Spectrum 300
              Miller 225 Thunderbolt (my first machine bought new 1980)
              Miller Digital Elite Titanium 9400

              Comment


              • #8
                Originally posted by ryanjones2150 View Post
                Friend of a friend bought a cheap-o mig welder...from northern tool I think...anyway, guy couldn't lay a useful bead with flux core to save his life. I told him I swap the polarity and his world will be happy again. He ever so cleverly informed me that I was wrong and that the problem was that his mig welder was an AC only mig welder and he was using DC mig wire. True story.
                so what happened after he told you that?
                HTP Invertig221 D.V. Water-cooled
                HTP Pro Pulse 300 MIG
                HTP Pro Pulse 200 MIG x2
                HTP Pro Pulse 220 MTS
                HTP Inverarc 200 TLP water cooled
                HTP Microcut 875SC

                Comment


                • #9
                  Originally posted by OscarJr View Post

                  so what happened after he told you that?
                  I would have just let it drop at that point, I mean heck, you sure can't fix stupid. I've tried a lot, and realized that was just as stupid.

                  www.facebook.com/outbackaluminumwelding
                  Miller Dynasty 700...OH YEA BABY!!
                  MM 350P...PULSE SPRAYIN' MONSTER
                  Miller Dynasty 280 with AC independent expansion card
                  Miller Dynasty 200 DX "Blue Lightning"

                  Miller Bobcat 225 NT (what I began my present Biz with!)
                  Miller 30-A Spoolgun
                  Miller WC-115-A
                  Miller Spectrum 300
                  Miller 225 Thunderbolt (my first machine bought new 1980)
                  Miller Digital Elite Titanium 9400

                  Comment


                  • #10
                    At first I thought he was screwin with me, but then he continued to explain how he had called the manufacturer of the machine and that is what they told him. I simply said, "oh. Well sounds like you have it all figured out then." He was so proud of himself for solving a great mystery of the world, I just let it be. Every time I see the guy he wants to talk welding, so I just let him ramble, agree with his assessment and nod my head.

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                    • #11
                      I have guys from other shops pick my brain on junk like that.
                      I used to fight it. Then I decided if they all got smarter we could all charge more. But.....some are beyond help, for various different reasons

                      www.facebook.com/outbackaluminumwelding
                      Miller Dynasty 700...OH YEA BABY!!
                      MM 350P...PULSE SPRAYIN' MONSTER
                      Miller Dynasty 280 with AC independent expansion card
                      Miller Dynasty 200 DX "Blue Lightning"

                      Miller Bobcat 225 NT (what I began my present Biz with!)
                      Miller 30-A Spoolgun
                      Miller WC-115-A
                      Miller Spectrum 300
                      Miller 225 Thunderbolt (my first machine bought new 1980)
                      Miller Digital Elite Titanium 9400

                      Comment


                      • #12
                        I probably could've screwed with him..."make sure you have a DC only ground clamp...", but I don't like the guy. I don't mess with people I don't like.

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                        • #13
                          Wait, there are different ground clamps for AC and DC! I wonder which clamp came with my machine....
                          Richard
                          West coast of Florida

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                          • #14
                            The 90 amp flux core wire feed welding machine from Chicago Electric/ Harbor Freight is AC , only, no MIG capability
                            Would probably weld CS sheet metal ,only, with lots of splatter, no aluminum capability.

                            what's z difference between AC & DC ground clamps?
                            Last edited by Almond farmer; 01-20-2018, 03:02 PM. Reason: Clamp question

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                            • #15
                              Originally posted by Almond farmer View Post
                              .

                              what's z difference between AC & DC ground clamps?
                              The price. AC is $8.99 and DC is $10.99. Well that's what I sold them for...Bob
                              Bob Wright

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