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Miller says to allow how much post-flow gas time after the TIG arc stops?

About 1 second per 10 amps.

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  1. About 1 second per 100 amps
  2. None, shut gas off with the arc
  3. About 1 second per 10 amps ✔

Why: Post-flow keeps argon around the hot tungsten and cooling weld so they do not oxidize. At 100 amps that is about 10 seconds.

Huh, didn't know that: Miller suggests 15 to 20 cfh for TIG shielding gas flow.

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Post-flow is the pause that refreshes. It also cools off the hot tungsten.
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References

Answer: About 1 second per 10 amps. Post-flow keeps argon around the hot tungsten and cooling weld so they do not oxidize. At 100 amps that is about 10 seconds.

  1. Guide to TIG Welding Basics (Miller) www.millerwelds.com/en-US/resources/knowledge-hub/tig-welding/how-to/guide-to-tig-welding-basics
    Allow 1 second per 10 amps of weld current after stopping the arc.
    Checked 2026-10-10.

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