Which characteristic applies to EWCeO2 (Cerium Tungsten) electrode?

• A. It is radioactive
• B. It decreases arc starting
• C. It improves current carrying capacity and arc stability
• D. It has lower emission than pure tungsten

Answer: (C)

EWCeO2 electrodes are tungsten with cerium oxide added. The cerium oxide improves how electrons are emitted from the tip and helps keep the arc steady, which raises the current-carrying capacity and enhances arc stability. The additive regenerates at the tip to resist contamination, reduces tungsten wear, and improves ignition characteristics, making the arc easier to start and maintain, especially under varying welding conditions. It is not radioactive, and it does not reduce emission or arc starting—in fact, it tends to improve both compared to pure tungsten. Therefore, the statement that it improves current carrying capacity and arc stability is the best fit.