Which type of current is not utilized in the GMAW process?

In the Gas Metal Arc Welding (GMAW) process, the predominant current types utilized are direct current (DC) and pulsed current. Direct current is particularly common, allowing for stable and controlled welding arcs. Pulsed current, on the other hand, is used to optimize heat input and improve weld quality in specific applications.

While alternating current (AC) is used in many welding processes, it is generally not employed in GMAW. This is due to the GMAW technology and the nature of the welding arc, where a stable arc control is essential. In GMAW, the focus is predominantly on achieving a smooth and consistent arc, which DC and pulse current provide, but AC introduces more fluctuations that can lead to inconsistent weld quality.

Direct Current Solid Wire, although a valid form of current in the context of GMAW, is inherently encompassed within the discussion of direct current usage. Consequently, B stands out as the correct answer since GMAW process does not utilize AC current at all.