Welding Level 3 GTAW Line F Practice Exam 2026 – Complete All-in-One Guide for Exam Success!

The color band that identifies lanthanated tungsten is black. This specific color coding is part of the American Welding Society (AWS) standards for tungsten electrodes, which helps welders easily identify the composition of the tungsten they are using.

Lanthanated tungsten electrodes contain a small percentage of lanthanum oxide, which enhances the performance of the electrode, particularly in terms of arc stability and overall longevity. The black color band indicates this unique composition, allowing welders to select the appropriate electrode for their specific welding tasks.

Understanding the color codes is essential for ensuring the correct electrode is used for the job, as different tungsten types are suited for various applications based on their characteristics, such as melting point, heat resistance, and arc stability. In contrast, other colors correspond to different tungsten types, such as those that are pure or contain other oxides, which would influence their behavior during the welding process.