What is the primary purpose of shielding gas in MIG welding?

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Multiple Choice

What is the primary purpose of shielding gas in MIG welding?

Explanation:
In MIG welding, shielding gas mainly serves to protect the weld from the surrounding air. The molten weld pool is highly reactive with oxygen, nitrogen, and moisture in the atmosphere, which can cause oxidation and porosity that weaken the weld. The gas blanket displaces air around the arc and puddle, creating a controlled environment so the metal fuses cleanly and consistently. While the gas type can influence heat input and penetration, the core purpose is preventing contamination. Shielding gas does not clean the base metal, nor is its primary job to cool the weld.

In MIG welding, shielding gas mainly serves to protect the weld from the surrounding air. The molten weld pool is highly reactive with oxygen, nitrogen, and moisture in the atmosphere, which can cause oxidation and porosity that weaken the weld. The gas blanket displaces air around the arc and puddle, creating a controlled environment so the metal fuses cleanly and consistently. While the gas type can influence heat input and penetration, the core purpose is preventing contamination. Shielding gas does not clean the base metal, nor is its primary job to cool the weld.

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