AG Mechanics CDE Practice Exam

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Prepare for the AG Mechanics CDE Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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

Acetylene
Carbon Dioxide
Helium
Oxygen

The correct answer is: 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.