Welder Red Seal · Question
Which of the following tungsten electrode types is generally NOT recommended for any GTAW application due to its radioactivity?
2% Thoriated tungsten (EWTh-2) contains thorium, which is radioactive, and its use has been diminishing due to health concerns regarding grinding dust and fumes
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Question: Which of the following tungsten electrode types is generally NOT recommended for any GTAW application due to its radioactivity?
Answer options:
- Pure tungsten (EWP)
- 2% Ceriated tungsten (EWCe-2) ✅ 2% Thoriated tungsten (EWTh-2)
- 2% Lanthanated tungsten (EWLa-2)
Correct answer: 2% Thoriated tungsten (EWTh-2)
Explanation: 2% Thoriated tungsten (EWTh-2) contains thorium, which is radioactive, and its use has been diminishing due to health concerns regarding grinding dust and fumes. While it still offers good performance, non-radioactive alternatives like Lanthanated or Ceriated tungsten are now preferred and recommended for general-purpose use. Pure, Ceriated, and Lanthanated tungstens are not radioactive.
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