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

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Multiple Choice

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

Explanation:
The shielding gas is used to create a protective environment around the weld puddle, preventing the molten metal from reacting with air. When metal is melted, oxygen, moisture, and other gases in the atmosphere can cause oxidation and porosity, weakening the weld. The gas blankets the weld area as the wire feeds and the arc travels, keeping contaminants out so the weld cools cleanly and solidifies with good strength. The wire provides the filler metal, not the gas, and while the gas can influence arc characteristics, its primary purpose is shielding the weld from contamination.

The shielding gas is used to create a protective environment around the weld puddle, preventing the molten metal from reacting with air. When metal is melted, oxygen, moisture, and other gases in the atmosphere can cause oxidation and porosity, weakening the weld. The gas blankets the weld area as the wire feeds and the arc travels, keeping contaminants out so the weld cools cleanly and solidifies with good strength. The wire provides the filler metal, not the gas, and while the gas can influence arc characteristics, its primary purpose is shielding the weld from contamination.

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