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On a MIG welder, wire feed speed mainly affects which two things?

Amperage and penetration.

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  1. Gas flow and slag removal
  2. Wire color and tip life
  3. Amperage and weld penetration ✔

Why: Faster wire feed means more amps and more penetration. Too much can cause burn-through.

Huh, didn't know that: For .030 inch wire, Miller multiplies by 2 inches per amp, so 125 amps is about 250 inches per minute.

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References

Answer: Amperage and weld penetration. Faster wire feed means more amps and more penetration. Too much can cause burn-through.

  1. MIG Welding: Setting the Correct Parameters (Miller) www.millerwelds.com/en-us/resources/knowledge-hub/mig-welding/how-to/mig-welding-setting-the-correct-parameters
    The wire feed speed affects amperage and weld penetration.
    Checked 2026-10-10.

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