The temperature of TIG welding can reach up to 10,000 degrees Fahrenheit or more. In the arc plasma, near the tip of the tungsten electrode, the temperature is about 18,000 degrees Celsius.
The electron that escapes from the tungsten electrode still has maximum energy and speed here, more than 2000 km/sec. These high temperatures are caused by collisions between the electrons and the gas ions.
A tungsten electrode with 2% thorium reaches a temperature of about 3325 degrees Celsius during welding. This comes close to the melting temperature of the tungsten, 3410 degrees Celsius.
