Which type of welding uses a non-consumable tungsten electrode?

Gas tungsten arc welding employs a non-consumable tungsten electrode to produce the weld. In this process, the tungsten electrode creates an electric arc between itself and the workpiece, generating the heat necessary to melt the metals being joined together. The use of a non-consumable electrode is key, as it does not get consumed during welding, which allows for greater precision and control over the weld pool. This method is particularly advantageous for welding thin materials and provides high-quality welds with excellent finish and minimal distortion.

The other welding methods mentioned utilize electrodes or filler materials that are consumable, meaning they do get used up during the welding process, affecting their application and the quality of the welds produced.