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  • AC/DC welder

    I have a question can someone tell me the advantages of a ac/dc over just an ac welder? Sorry if it is a dumb question. Curious
    Thanks
    Joe
    Tecumseh, MI

  • #2
    Its easier to strike an arc, instead of peck peck peck with an ac you just light it up with dc. Plus some rods are dc only. 7018 ac rod is ok, but regular 7018 runs better on dc...Bob
    Bob Wright

    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

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    • #3
      dc- deep penitration dc+ reverse less penitration for out of postion ( over head, vertical up, horizatol) ac least amout of penitration used for sheet metal
      miller 330 a/pb tig miller 175 mig
      student and hobbiest

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      • #4
        Originally posted by link523
        dc- deep penitration dc+ reverse less penitration for out of postion ( over head, vertical up, horizatol) ac least amout of penitration used for sheet metal
        I think you got it backwards? For SMAW, DCEP (reverse polarity) gives greatest penetration. DCEN (straight polarity) gives the least. I almost never need it, even when out of position.

        AC will be in the middle for penetration, but you'll never use it unless you are trying to counter arc blow or something. The electrode selection for DC and its ease to use and less spatter will make DCEP just about all you ever want or need. DC is also much safer in damp conditions when it's easier to get shocked while welding or changing electrodes.

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        • #5
          sorry your right i had it all wrong if you go to education at the top then welding libray then tech tips then arc welding there it is listed all currents an electrons you can use with each setting
          miller 330 a/pb tig miller 175 mig
          student and hobbiest

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          • #6
            The only thing I can add here is to elaborate on what mac said about blowback. If youre metal is magnatized, this causes blowback and the AC helps combat that. An example of magnatized metal would be something that gets a lot of friction use like a hay elevator.
            Just thought I would add that untill last year all I had was an old Westinghouse 300 amp AC machine that has done a gaggle of welding. If you have an AC machine dont feel that you cant be productive, but if youre looking to buy a welder I would look for something that gives you the options of AC or DC.
            Last edited by burninbriar; 02-20-2006, 03:57 PM.
            To all who contribute to this board.
            My sincere thanks , Pete.

            Pureox OA
            Westinghouse 300 amp AC stick
            Miller Syncrowave 250
            Hexacon 250 watt solder iron

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            • #7
              Originally posted by aametalmaster
              Its easier to strike an arc, instead of peck peck peck with an ac you just light it up with dc. Plus some rods are dc only. 7018 ac rod is ok, but regular 7018 runs better on dc...Bob
              Not only works better, but also your work doesn't break!
              Save our species! Lower metal prices!

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              • #8
                Originally posted by 2112
                Not only works better, but also your work doesn't break!
                No need to scare people looking to buy the hundreds of thousands of old used AC welders out there. Just as with DC welding, the skill is in the operator, not the machine. There are literally millions of structural welds out there made by AC buzzboxes that are perfectly fine and weren't all that much more difficult to perform.

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                • #9
                  Not trying to scare people. Just saying that some times, you get better results from a DC output. I've always been told that when using E7018 that you HAVE to use a DC output or else you don't get enough penetration.
                  Save our species! Lower metal prices!

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                  • #10
                    Originally posted by 2112
                    Not trying to scare people. Just saying that some times, you get better results from a DC output. I've always been told that when using E7018 that you HAVE to use a DC output or else you don't get enough penetration.
                    Agreed. DC is definitely smoother and easier and allows a greater selection of electrodes. Almost always worth the extra money when shopping for a machine.

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                    • #11
                      Thanks guys for all of the info.
                      Joe
                      Joe
                      Tecumseh, MI

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                      • #12
                        DC over AC

                        Just try ti Tig weld with AC.

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                        • #13
                          I Tig weld all day every day with AC!! It is what you use on aluminum.

                          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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