Which tungsten designation corresponds to thorium-containing tungsten commonly used in GTAW?

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Prepare for the GTAW Advanced Welding Exam. Use flashcards and multiple choice questions, each with hints and detailed explanations. Excel in the exam!

Multiple Choice

Which tungsten designation corresponds to thorium-containing tungsten commonly used in GTAW?

Explanation:
Tungsten electrode designations encode the dopants in the metal. The thorium-containing designation is EWTh-1, where Th = thorium oxide doping and the “-1” signals about 1% ThO2. This type has been popular in GTAW for easy arc starting and strong electron emission, especially on DC welding. There’s also EWTh-2 for about 2% ThO2, but the item shown matches the 1% thorium-containing type. The other options represent different tungsten families: pure tungsten (no dopant), lanthanum-doped tungsten, and zirconia-doped tungsten, none of which indicate thorium.

Tungsten electrode designations encode the dopants in the metal. The thorium-containing designation is EWTh-1, where Th = thorium oxide doping and the “-1” signals about 1% ThO2. This type has been popular in GTAW for easy arc starting and strong electron emission, especially on DC welding. There’s also EWTh-2 for about 2% ThO2, but the item shown matches the 1% thorium-containing type. The other options represent different tungsten families: pure tungsten (no dopant), lanthanum-doped tungsten, and zirconia-doped tungsten, none of which indicate thorium.

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