What does ACHF stand for in welding terms?

ACHF stands for Alternating Current High Frequency, which is a critical concept in the field of welding, particularly in relation to TIG (Tungsten Inert Gas) welding. This type of current provides better control over the arc stability and heat input, which is essential for quality welds, especially with thin materials or when working with aluminum and magnesium. High frequency arc starting helps to initiate the weld without having to make contact with the workpiece, reducing the risk of contamination and ensuring a cleaner, more precise weld.

The other terms presented don't accurately reflect the meaning of ACHF in the context of welding. For instance, "Low Frequency" and "High Flow" do not pertain to the high-frequency control associated with the arc, which is central to certain welding processes. Similarly, "Heavy Fabrication" does not relate to the electrical parameters of the welding process in question. Understanding ACHF and its implications enhances a welder's capability to execute precision tasks effectively.