GTAW Advanced Welding Practice Exam

Which statement describes Green, Pure Tungsten Electrode (EWP)?

It has the best heat resistance It is only used with DC It has the poorest heat resistance and electron emission characteristics and can be used with AC for welding metals It is not suitable for any AC

Correct Answer:

It has the poorest heat resistance and electron emission characteristics and can be used with AC for welding metals

Explanation:

Green, Pure Tungsten Electrode is unalloyed tungsten, so it lacks the dopants that boost electron emission and current-carrying capacity. That means starting and maintaining a stable arc is harder, and the tip wears more quickly when used at higher amps. Despite that, it can be used with alternating current, since the AC cycle helps refresh the tip and re‑activate the surface, making it suitable for welding metals with AC (like aluminum). So this description highlights the trade-off: poorer electron emission and arc-start behavior, but compatibility with AC.

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