What does AC stand for in welding terms?

In welding terminology, AC stands for Alternating Current. This form of electrical current changes direction periodically, which is essential for certain types of welding processes, such as TIG (Tungsten Inert Gas) welding, particularly when working with materials like aluminum and magnesium. Alternating current allows for better control over the heat input and can aid in cleaning the weld area due to its ability to reverse polarity, thus helping to remove oxide layers and improve arc stability.

The other terms provided do not represent the standard terminology used in welding. Atomic current and analytical current are not recognized as types of electrical current in this context. Although "alternative current" might sound similar, it is not the correct terminology; the accepted term is "alternating current." By understanding the correct terminology, welders can communicate effectively about the processes and techniques they are using.