What is the time called during which gas continues flowing after the welding current has stopped?

The term used to describe the period during which the shielding gas continues to flow after the welding current has stopped is known as postflow. This function is crucial in gas tungsten arc welding (GTAW) as it serves to protect the weld area from atmospheric contamination, such as oxidation, while the weld cools. Ensuring that the gas remains flowing after the arc has extinguished helps preserve the integrity of the weld and contributes to a cleaner and more defect-free finish.

The duration of postflow can vary depending on the material being welded and other setup parameters, but its purpose remains consistent across various welding processes. Having a proper postflow time enhances the quality of the weld by minimizing the risk of defects caused by ambient exposure immediately after welding.

Understanding the importance of postflow time is essential for welders, as it directly impacts the results of the welding process, reinforcing the need to carefully consider gas flow settings during GTAW operations.