Which gas is inert?

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Master Gas Tungsten Arc Welding concepts with our WELD 250 Test. Includes diverse question formats with explanations to boost your confidence and exam readiness.

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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