AG Mechanics CDE Practice Exam

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What type of shielding gas is typically used in MIG welding?

  1. Argon

  2. Carbon dioxide

  3. Helium

  4. Oxygen

The correct answer is: Argon

MIG welding, also known as Gas Metal Arc Welding (GMAW), typically uses a shielding gas to protect the weld area from the atmosphere. This gas is essential in preventing oxidation and other atmospheric contamination from affecting the weld. While argon, a basic element, is typically used in MIG welding, carbon dioxide, helium, and oxygen are also gases that can be used for specific purposes. Carbon dioxide is commonly used for welding thicker materials, while helium is often used for welding nonferrous metals. Oxygen, on the other hand, can cause excessive spatter and porosity in the weld. Therefore, A is the correct answer as it is the most commonly used and versatile shielding gas in MIG welding processes.

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