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ER70S-6 solid MIG wire is the usual pick for welding what?

Dirty or rusty mild steel.

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  1. Aluminum
  2. Dirty or rusty mild steel ✔
  3. Stainless steel

Why: ER70S-6 has more deoxidizers than ER70S-3, which helps with surface contamination. ER70S-3 is the all-purpose wire.

Huh, didn't know that: Miller says .030 inch is a good all-around wire diameter.

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Where did the chemist put his dirty dishes? In the zinc.
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References

Answer: Dirty or rusty mild steel. ER70S-6 has more deoxidizers than ER70S-3, which helps with surface contamination. ER70S-3 is the all-purpose wire.

  1. Understanding the Basics of MIG Welding for Mild Steel (Miller) www.millerwelds.com/en-us/resources/knowledge-hub/mig-welding/how-to/understanding-the-basics-of-mig-welding-for-mild-steel
    Use ER70S-6 wire when more deoxidizers are needed for welding on dirty or rusty steel.
    Checked 2026-10-10.

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