When is the operational voltage observed in GTAW?

In Gas Tungsten Arc Welding (GTAW), operational voltage is observed during the actual welding process. This is the voltage present when the welding circuit is complete and the arc is established between the tungsten electrode and the workpiece. At this stage, the welder has control over the arc and the heat generated, allowing for proper penetration and fusion of materials being welded.

When the arc is initiated, an initial higher voltage may be necessary to establish the arc, but the operational voltage is defined by the sustained voltage level that occurs while welding. The machine needs to be turned on for this operational voltage to be present, meaning it will not be observed when the machine is off or while preparing the tungsten. Therefore, during welding is the key moment when the operational voltage is actively in effect, enabling the welding process to occur efficiently.