Final answer:
GTAW and PAW processes are different from other arc welding processes because they use non-consumable electrodes. Option B is correct.
Step-by-step explanation:
The aspect of the GTAW (Gas Tungsten Arc Welding) and PAW (Plasma Arc Welding) processes that makes them different from other arc welding processes is the use of non-consumable electrodes.
Unlike other arc welding processes that use consumable electrodes, GTAW and PAW use non-consumable electrodes made of tungsten. These electrodes do not melt and add filler metal to the weld pool. Instead, they create an arc that generates the heat needed for welding.
In GTAW, a shielding gas, typically argon, is used to protect the weld pool and the tungsten electrode from contamination. PAW also uses a non-consumable tungsten electrode but it utilizes a high-speed plasma jet to generate heat. The plasma jet is made by passing a gas, such as argon or a mixture of gases, through an electric arc.