What is the term for the shielding gas flow that occurs before the GTA welding current starts?

The term describing the shielding gas flow that takes place before the GTA welding current is initiated is indeed preflow. In the context of Gas Tungsten Arc Welding (GTAW), preflow refers to the process of allowing the shielding gas to flow around the tungsten electrode prior to starting the arc. This is crucial for ensuring that the welding area is properly shielded from contaminants and atmospheric gases, which could potentially affect the quality of the weld.

By utilizing preflow, welders create a protective envelope around the welding zone. This preemptive measure helps in stabilizing the shielding gas coverage, leading to a cleaner and more reliable weld once the arc is ignited. The significance of this practice cannot be overstated, as a proper shield is essential for preventing oxidation and defects in the welded materials.

In comparison, postflow refers to the continued flow of shielding gas after the welding has been completed, serving to cool down the tungsten electrode and protect the weld from contamination while it solidifies. Flow management signifies overall control of gas flow, which is broader and does not specifically denote the timing in relation to the arc initiation. Start flow is not a standard term commonly recognized in the context of GTAW processes. Thus, preflow accurately captures the critical preparatory