What troubleshooting step should be taken if the arc goes out during GTAW?

When troubleshooting an issue where the arc goes out during Gas Tungsten Arc Welding (GTAW), checking the arc length and gas flow is essential. The arc length refers to the distance between the tungsten electrode and the workpiece; if this distance is too great, the arc may extinguish. Additionally, the shielding gas flow is critical in protecting the weld pool from contamination. Insufficient gas flow can lead to an unstable arc, which can also cause the arc to go out.

By ensuring that both the arc length is appropriate and that the shielding gas is flowing correctly, the welder can stabilize the arc and prevent further interruptions. This step is foundational in maintaining the quality and integrity of the weld.

Adjusting the filler material or changing the tungsten electrode might not directly address the immediate reason for the arc extinguishing and could lead to unnecessary delays in troubleshooting. Restarting the machine may not resolve the underlying issue, as improper settings or conditions might still persist. Hence, focusing on the arc length and gas flow provides a more effective first response to this problem.