What does AC stand for in welding?

In welding, AC stands for Alternating Current. This type of electrical current changes direction periodically, alternating between positive and negative values. This characteristic makes AC valuable in various welding processes, particularly for certain types of materials and applications.

For instance, AC is often used in TIG (Tungsten Inert Gas) welding when working with aluminum and magnesium. The alternating current helps to clean the oxide layer off of these metals during the welding process, allowing for a better bond and overall stronger weld.

Understanding the role of AC in welding is crucial because it can impact heat input, welding speed, and the quality of the weld bead. Recognizing the significance of Alternating Current in the context of different welding methods is essential for selecting the appropriate equipment and settings to achieve optimal results.