AG Mechanics CDE Practice Exam 2025 – Comprehensive Test Prep Resource

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During MIG welding, which type of current is generally used?

AC

During MIG (Metal Inert Gas) welding, direct current (DC) is generally used. DC current flows in one direction and is ideal for creating a stable arc during welding. This type of current allows for better control over the welding process and produces consistent results. Alternating current (AC) periodically changes direction, which can lead to a less stable arc and potential issues during welding. High frequency and low frequency currents are not typically used in MIG welding processes.

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DC

High frequency

Low frequency

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