Which gas is inert?

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Prepare for the Gas Tungsten Arc Welding (GTAW) WELD 250 Test with our comprehensive study material. Our quiz features flashcards, multiple choice questions, and in-depth explanations on every topic. Start your journey to becoming an expert welder today!

Multiple Choice

Which gas is inert?

Explanation:
Shielding gas used in GTAW must be chemically nonreactive to protect the molten weld from air. Helium is a noble gas, so it is inert and does not readily react with the molten metal, forming a protective blanket around the arc and weld pool. In contrast, hydrogen can be reactive and may cause porosity or embrittlement, while nitrogen and oxygen from the air can oxidize or nitride the weld metal. Because of its inert nature, helium is the correct choice for shielding in this context.

Shielding gas used in GTAW must be chemically nonreactive to protect the molten weld from air. Helium is a noble gas, so it is inert and does not readily react with the molten metal, forming a protective blanket around the arc and weld pool. In contrast, hydrogen can be reactive and may cause porosity or embrittlement, while nitrogen and oxygen from the air can oxidize or nitride the weld metal. Because of its inert nature, helium is the correct choice for shielding in this context.

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