Which of the following modes of metal transfer for the GMAW process uses the highest energy?

In the Gas Metal Arc Welding (GMAW) process, spray transfer is characterized by a stable mode of metal transfer that occurs at high current levels. In this mode, the welding wire is transferred in fine droplets that are propelled through the arc to the workpiece, resulting in a more stable and smoother weld. The energy in this transfer mode is higher due to the increased heat input associated with the higher current, which allows for deeper penetration and a stronger bond in thicker materials.

Spray transfer offers several advantages, including a high deposition rate and the ability to weld thicker sections effectively. It produces less spatter compared to other transfer modes, contributing to a cleaner weld environment. This method is particularly favored in situations that require high productivity and excellent weld quality.

Understanding the different transfer modes in GMAW is essential for selecting the appropriate method for a given application, and spray transfer's high energy utilizes the welding machine's capabilities to achieve superior results.