GTAW Advanced Welding Practice Exam

Which characteristic applies to EWLa (Lonathium Tungsten) electrode?

It is radioactive It is not radioactive and improves current carrying capacity It has the highest arc voltage of all It is not suitable for DCEN

Correct Answer:

It is not radioactive and improves current carrying capacity

Explanation:

Lanthanated tungsten electrodes are non-radioactive and provide higher current-carrying capacity than pure tungsten, which helps arc stability and allows welding at higher amperages without rapid electrode wear. The lanthanum oxide coating improves electron emission and reduces tip contamination, making starting and maintaining the arc easier. They’re suitable for both AC and DC welding, including DCEN, so the idea that they’re not suitable for DCEN isn’t accurate. Arc voltage isn’t a fixed property of the electrode type; it depends on current, gas, and arc length, not the electrode alone. So the statement that best fits EWLa is that it is not radioactive and improves current carrying capacity.

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