Final answer:
Shielding in GTAW and PAW processes is primarily accomplished through the use of inert gas like argon to prevent contamination and defects in the weld.
Step-by-step explanation:
In GTAW (Gas Tungsten Arc Welding) and PAW (Plasma Arc Welding) processes, shielding is primarily accomplished through the use of an inert gas.
This is done to prevent the welding area from being contaminated by atmospheric gases, which can weaken the weld and cause defects. In GTAW, the most commonly used shielding gas is argon, while in PAW, a combination of argon and hydrogen is often used.