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Compared with 75/25 argon and CO2, what does 100% CO2 shielding gas tend to give?

More spatter and a slightly erratic arc.

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  1. More spatter and a slightly erratic arc ✔
  2. Less spatter and a smoother arc
  3. A perfectly steady arc with no spatter

Why: Pure CO2 is called C-100. Miller says it may produce a bit more spatter and a slightly erratic arc compared with a 75/25 blend.

Huh, didn't know that: Miller says a 90/10 argon and CO2 mix (C-10) is a good option for some jobs.

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References

Answer: More spatter and a slightly erratic arc. Pure CO2 is called C-100. Miller says it may produce a bit more spatter and a slightly erratic arc compared with a 75/25 blend.

  1. Best Gas for MIG in DIY (Miller) www.millerwelds.com/en-us/resources/knowledge-hub/mig-welding/how-to/what-type-of-gas-is-best-for-mig-welding-in-diy-applications
    C-100 may produce a bit more spatter and result in a slightly erratic arc.
    Checked 2026-10-10.

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