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What is the most common cause of porosity when MIG welding?

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  1. Using a helmet lens that is too dark
  2. Poor shielding of the weld pool
  3. Holding the gun too steady

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References

  1. Hobart Brothers, MIG Troubleshooting for Metal-Cored and Solid Wire www.hobartbrothers.com/resources/technical-articles/mig-troubleshooting-for-metal-cored-and-solid-wire Checked 2026-10-10.

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