AG Mechanics CDE Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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Which gas is commonly used as a shielding gas in TIG welding?

Acetylene

Acetylene is commonly used as a shielding gas in TIG (Tungsten Inert Gas) welding because it is an inert gas that helps protect the weld pool from atmospheric contamination. Acetylene does not react with the metals being welded, allowing for a clean and strong weld to be produced. On the other hand, the other options are not typically used as shielding gases in TIG welding: Carbon Dioxide can be used in MIG (Metal Inert Gas) welding, Helium can be used for certain applications like aluminum welding, and Oxygen can react with the weld pool and cause oxidation issues.

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Carbon Dioxide

Helium

Oxygen

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