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Electrode Wire, ER70S-3 or ER70S-6

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  • Electrode Wire, ER70S-3 or ER70S-6

    What would the reasoning be for specifying ER70S-3 wire over using ER70S-6? Repairs to the frames on Dodge trucks specify S-3 and note not to substitute. The commonly recommended electrode is S-6 by most car companies. The shielding gas is 75/25. Can anyone shed some light on this for me?

  • #2
    While it doesn't answer very well why Dodge specifies S-3, maybe someone with more automotive experience can look at the differences in the wires and tell us:

    Check out Lincoln's poster on MIG wires here:

    http://content.lincolnelectric.com/p...ture/wc19m.pdf

    Here're the relevent excerpts:

    S-3: Our most popular MIG wire, SuperArc L-50, premium copper coated wire, is an excellent choice for 70,000 psi (483 MPa) tensile strength,
    carbon steel base materials. SuperArc L-50 has moderate levels of silicon and manganese for deoxidation and cleaning action. Designed for
    use on clean, oil-free, and rust-free base material. Will tolerate light millscale. SuperArc L-50 also has an excellent reputation for feedability
    and trouble-free performance. Shielding gases include argon/carbon dioxide blends, argon/oxygen blends, straight carbon dioxide.

    S-6: Lincoln’s premium copper coated MIG wire, SuperArc L-56 is an excellent choice for welding on metals with a medium to high presence of
    millscale. For best performance use on clean, oil-free, and rust-free base material. Best weld appearance and toe wetting when compared to
    ER70S-3 and ER70S-4 classifications. SuperArc L-56 has high silicon and manganese deoxidizer levels. Superior feedability and excellent
    arc characteristics are trademarks of SuperArc L-56. Shielding gases include argon/carbon dioxide blends, argon/oxygen blends, straight
    carbon dioxide, and three or four-part gas mixes.

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    • #3
      Originally posted by Wallace2
      What would the reasoning be for specifying ER70S-3 wire over using ER70S-6? Repairs to the frames on Dodge trucks specify S-3 and note not to substitute. The commonly recommended electrode is S-6 by most car companies. The shielding gas is 75/25. Can anyone shed some light on this for me?
      Because some idiot wrote the specificaton. 70S-6 will do you just fine, S-3 is used in alot of manufacturing applications to keep cost down, and since Dodge likely uses that in product whoever wrote up the instructions probably defaulted to the 70S-3 recommendation.
      Ron

      ShopFloorTalk

      Millermatic 350P, Roughneck 4012 and Ironmate guns
      Dynasty 300DX, Coolmate 3, Crafter CS-310 Torch
      Trailblazer 302, 12RC, WC-24
      30A spoolgun
      Spectrum 2050

      Thermal Arc Plasma Welder PS-3000/WC-100B

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      • #4
        I worked in some piss poor shops and even they were smart enough to buy S-6 wire , and i bet most of the buyers there didn't have degrees ....Bob
        Bob Wright

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

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        • #5
          S-3

          It seems most of the people I sell 70S-3 to are welding Galvanized Fencing, corralls, or water Tanks using straight Co2. It seems to work better than S-6 on this stuff. Not much cheaper than s-6 L-50 list for .035 44lb is 1.93lb on L-50. 2.10 on 44 lb L-56. But hey .17 a lb adds up if you use lots of wire.
          Dynasty 200DX With TEC Superflex 9 & 17 Torches,
          Hypertherm 30A Plasma
          Rincoln SP130T Mig

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          • #6
            Originally posted by Glenn B
            It seems most of the people I sell 70S-3 to are welding Galvanized Fencing, corralls, or water Tanks using straight Co2. It seems to work better than S-6 on this stuff. Not much cheaper than s-6 L-50 list for .035 44lb is 1.93lb on L-50. 2.10 on 44 lb L-56. But hey .17 a lb adds up if you use lots of wire.
            A lot of manufacturers use S-3 especially in automated cells, all driven on cost.
            Ron

            ShopFloorTalk

            Millermatic 350P, Roughneck 4012 and Ironmate guns
            Dynasty 300DX, Coolmate 3, Crafter CS-310 Torch
            Trailblazer 302, 12RC, WC-24
            30A spoolgun
            Spectrum 2050

            Thermal Arc Plasma Welder PS-3000/WC-100B

            Comment


            • #7
              I haven't seen L-56 in a drum, but at weldingsupply.com L-50 is $1.26/Lb in a 500Lb drum while L-56 is $1.32/Lb on a 60Lb spool. I suspect one would use S-3 simply because S-6 isn't needed in some applications.
              - Heath

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