Welding Level 3 GTAW Line F Practice Exam 2025 – Complete All-in-One Guide for Exam Success!

Using pulsed GTAW (Gas Tungsten Arc Welding) results in less distortion primarily due to the controlled heat input during the welding process. In pulsed GTAW, the welding current alternates between a higher peak current and a lower background current. The peak current provides the necessary heat for melting the base metal and filler material, while the background current allows for cooling.

This cycling between high and low currents limits the overall amount of heat that is input into the workpiece, which mitigates thermal expansion and reduces the likelihood of distortion. Since distortion in welds often arises from excessive heat causing warping or changes in the geometry of the workpiece, maintaining a lower average heat input is crucial.

Furthermore, the precise control offered by pulsed techniques makes it easier to achieve a tighter weld pool, which aids in reducing the risk of overheating, further contributing to less distortion in the final weld. Thus, minimizing thermal impact is a significant benefit of using pulsed versus continuous GTAW processes, allowing for more refined and accurate welds with better structural integrity.