In SMAW, which component is typically the only moving part in a Rectifier Unit?

In a Rectifier Unit used for Shielded Metal Arc Welding (SMAW), the cooling fan is indeed the primary moving component. A rectifier is responsible for converting alternating current (AC) into direct current (DC), providing a stable electrical output for welding processes.

The cooling fan plays a vital role in maintaining the rectifier's optimal operating temperature by dissipating heat generated during the welding process. This helps prevent overheating and ensures the longevity and reliability of the equipment. Other components, such as the welding electrode, power switch, and welding torch, do not have moving parts in the context of the rectifier unit itself; they serve different functions where the electrode is consumable material for the weld, the power switch controls electrical flow, and the welding torch is the assembly for guiding the electrode and shielding gas in gas tungsten arc welding. Thus, the cooling fan stands out as the only component with mechanical movement in this context.