Which tungsten electrode is well suited for welding steel and nickel alloys but not aluminum or magnesium?

Which tungsten electrode is well suited for welding steel and nickel alloys but not aluminum or magnesium?

• A. Thoriated tungsten
• B. Cerium tungsten
• C. Lanthanum tungsten
• D. Zirconium tungsten

Answer: (B)

Cerium-doped tungsten electrodes provide a stable, forgiving arc and good life when welding iron-base alloys like steel and nickel alloys with direct current. The cerium oxide dopant helps maintain a clean arc and steady emission, which suits DC welding of these metals well. Aluminum and magnesium are typically welded with approaches that rely on effective oxide removal and arc stability under alternating current; cerium-doped tungsten doesn’t perform as well for AC GTAW on Al or Mg, so it isn’t the best choice for those metals. That’s why this electrode is considered well suited for steel and nickel alloys but not ideal for aluminum or magnesium.

Cerium-doped tungsten electrodes provide a stable, forgiving arc and good life when welding iron-base alloys like steel and nickel alloys with direct current. The cerium oxide dopant helps maintain a clean arc and steady emission, which suits DC welding of these metals well. Aluminum and magnesium are typically welded with approaches that rely on effective oxide removal and arc stability under alternating current; cerium-doped tungsten doesn’t perform as well for AC GTAW on Al or Mg, so it isn’t the best choice for those metals. That’s why this electrode is considered well suited for steel and nickel alloys but not ideal for aluminum or magnesium.