Which statement describes EWZr (Zirconium Tungsten) electrode?

• A. It cannot be used with AC
• B. It is used only for stainless steel
• C. It can be used with both AC and DC and is good for aluminum/magnesium
• D. It has the same emission as thorium tungsten

Answer: (C)

EWZr electrodes are zirconium-doped tungsten designed for versatility in TIG welding. The zirconium addition improves arc starting and stability, making the electrode suitable for both alternating current and direct current. This is especially advantageous when welding aluminum and magnesium, whose oxide layers are effectively managed with AC to keep the arc clean and stable. So, describing it as usable with both AC and DC and good for aluminum/magnesium reflects how this electrode is chosen for its arc performance and material compatibility. The other statements don’t fit: it can be used with AC, it isn’t limited to stainless steel, and its emission characteristics differ from thorium tungsten.