What is the primary material of the electrode used in TIG welding?

The primary material of the electrode used in TIG (Tungsten Inert Gas) welding is tungsten. Tungsten is chosen for this application due to its very high melting point, which exceeds 3,400 degrees Celsius (6,152 degrees Fahrenheit), making it capable of maintaining its solid state even under the high temperatures generated during the welding process. This property is essential for the performance of the TIG welding process, allowing for a stable arc and precise control during welding.

Additionally, tungsten has excellent conductivity and is resistant to burn-off, which is critical as the electrode must sustain the intense heat of the arc without degrading. Other materials like copper, aluminum, and nickel do not possess the thermal stability or high melting points needed for effective use as an electrode in TIG welding, which places tungsten as the definitive choice for this welding method.