Which color corresponds to 2% thoriated tungsten?

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Enhance your TIG welding skills with the Nebraska GTAW FFA TIG Welding Exam. This exam features multiple choice questions and realistic scenarios to prepare you for success in TIG welding.

Multiple Choice

Which color corresponds to 2% thoriated tungsten?

Explanation:
In TIG welding, the color of the tungsten electrode shows what alloying elements are in the tip. Red specifically marks a thoriated tungsten with about 2% thorium. That thorium content helps with electron emission and gives a reliable, easy arc start, which is why this type is commonly used for DC welding of steels and stainless. Because thorium is radioactive, handle these electrodes with appropriate care and follow safety guidelines. Other colors indicate different tungsten varieties (like pure, ceria/lanthanated blends) and are chosen for different welding needs, such as AC or specific amperage ranges. So the red-coded electrode is the 2% thoriated tungsten.

In TIG welding, the color of the tungsten electrode shows what alloying elements are in the tip. Red specifically marks a thoriated tungsten with about 2% thorium. That thorium content helps with electron emission and gives a reliable, easy arc start, which is why this type is commonly used for DC welding of steels and stainless. Because thorium is radioactive, handle these electrodes with appropriate care and follow safety guidelines. Other colors indicate different tungsten varieties (like pure, ceria/lanthanated blends) and are chosen for different welding needs, such as AC or specific amperage ranges. So the red-coded electrode is the 2% thoriated tungsten.

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