What diameters do tungsten electrodes come in?

• A. 0.015 to 1/8 inch
• B. 0.010 to 1/4 inch
• C. 0.020 to 1/16 inch
• D. 0.005 to 1/32 inch

Answer: (B)

Tungsten electrodes for GTAW are made in a wide range of diameters to match welding current and technique. The diameter you choose affects arc stability, heat concentration, and how long the electrode lasts under a given current. Smaller diameters (like 0.010 inch) are used for fine, low-current work and give precise control, but wear quickly at higher currents. Larger diameters (up to about 1/4 inch) handle higher currents and provide better heat sinking, which is important for heavier welds. Because you need sizes that cover both micro and high-current applications, the practical range runs from roughly 0.010 inch to 0.250 inch in diameter. That’s why this broad range is the best fit. The other ranges are too narrow, omitting either the very small or the very large sizes commonly used.