In the GMAW process, which current is never utilized?

In the Gas Metal Arc Welding (GMAW) process, the use of Alternating Current (AC) is not typical. GMAW primarily relies on Direct Current (DC) due to its ability to efficiently provide a stable arc and control heat input for a variety of materials. DC current, whether straight or reverse polarity, is favored in GMAW because it offers a more consistent and controllable heat source, which is critical for achieving the desired weld quality.

Pulsed current, while more advanced, is also mainly a variant of DC current rather than being AC, used to better manage heat and improve penetration in specific applications. Low frequency current, which is less commonly discussed in welding, typically refers to AC at a lower frequency than standard utility rates but is not standard in GMAW practices. As a result, AC current is not utilized in the GMAW process, making it the correct answer.