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Filler rod for Mild Steel

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  • Filler rod for Mild Steel

    Hey folks,

    I just bought a Maxstar 200 to puts around in the Garage & need to get some some filler rod for it.

    Im going to be doing mild steel stuff. I did a search & came up with ER70S-6, does that does that sound right?? i also found -2, but cant figure out what the difference is between -2 & -6.

    thanks
    bob

  • #2
    ER70S-6 typically contains more Mn, Si and C deoxidizers than -2. ER70S-2 contains a bit of Ti, Zr and Al for additional deoxidation, whereas the -6 has none. In my experience both work well but note that the Al in the -2 makes the puddle a little stickier, i.e. it doesn't flow out as easily as the -6 and it freezes a little quicker. The LWS I shop at sells just the -2 in prepackaged tubes unless another type is specially ordered. However a local auto supply that also sells welding supplies carries only the -6 and sells it by the pound in bulk form. I've been buying the -6 from them because it is much less expensive that way.
    Scott

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    • #3
      For most hobby welders, it won't matter whether you use -2, -3, or -6.

      The main differences in practice are that -2 is more ductile and -6 is more tolerant of small amounts of contamination.
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      • #4
        Originally posted by Dmaxer1 View Post
        ER70S-6 typically contains more Mn, Si and C deoxidizers than -2. ER70S-2 contains a bit of Ti, Zr and Al for additional deoxidation, whereas the -6 has none. In my experience both work well but note that the Al in the -2 makes the puddle a little stickier, i.e. it doesn't flow out as easily as the -6 and it freezes a little quicker. The LWS I shop at sells just the -2 in prepackaged tubes unless another type is specially ordered. However a local auto supply that also sells welding supplies carries only the -6 and sells it by the pound in bulk form. I've been buying the -6 from them because it is much less expensive that way.

        These were welded with -2 and you can see how the puddle tends to freeze
        as mentioned by Dmaxer ....

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        • #5
          Right on guys. thanks mucho.

          Bob

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