Which statement is true about tungsten electrode classification?

• A. Tungsten electrodes are classified in AWS A5.12
• B. Tungsten electrodes are not classified by AWS
• C. Tungsten electrodes classification is determined by diameter
• D. Tungsten electrodes have a color code only

Answer: (A)

Tungsten electrode classification is defined by a formal standard, not by size or color. The official AWS standard for tungsten electrodes sets up the different types (such as pure tungsten and various doped variants) and their intended use with different welding conditions. That’s why the statement that tungsten electrodes are classified in AWS A5.12 is true. Diameter only describes physical size and color coding is just a visual cue, not the way the electrode is officially classified. So the correct idea to rely on is that AWS A5.12 governs how tungsten electrodes are classified and specified.