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SESK: Stuff Everyone Should Know · sesk.info/weld-position-vertical-sag

What does the weld puddle naturally tend to do when welding vertically?

It sags down.

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  1. Sag ✔
  2. Harden instantly
  3. Float upward

Why: Gravity pulls the molten puddle downward. Welders adjust settings and technique to control it.

Huh, didn't know that: Miller says vertical up is more common than vertical down, especially on thicker material.

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Gravity really keeps me grounded.
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References

Answer: Sag. Gravity pulls the molten puddle downward. Welders adjust settings and technique to control it.

  1. What Are the 4 Basic Welding Positions? (Miller) www.millerwelds.com/en-US/resources/knowledge-hub/welding-basics/what-are-the-4-basic-welding-positions-and-when-should-you-use-them
    When welding vertically, the puddle will naturally tend to sag
    Checked 2026-10-10.
  2. 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
    consider reducing the voltage and amperage by 10 to 15 percent from the settings for the same weld in the flat position
    Checked 2026-10-10.

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