California Welding Contractor (C-60 License) Practice Exam

Which welding process involves shielding gas and a consumable wire?

GMAW SMAW PAW Oxy-fuel

Correct Answer:

GMAW

Explanation:

Shielding gas plus a continuously fed consumable wire defines gas metal arc welding. In this process, the wire serves as both electrode and filler metal and feeds through the welding gun as the arc heats the workpiece. A shielding gas—such as argon, CO2, or a mix—flows around the weld pool to protect it from air contamination, preventing oxidation and porosity. This combination is what sets it apart from other methods: some use flux for shielding instead of an external gas, some rely on a flame for heating, and others use a plasma arc with a non-consumable electrode rather than a continuously fed wire. So the welding process described is gas metal arc welding.

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