Which shielding gas combinations meet the requirements for GTAW-P welding?

• A. Oxygen and Nitrogen
• B. Argon, Helium
• C. Hydrogen and Argon
• D. Neon and Helium

Answer: (B)

In GTAW-P welding, the shielding gas must protect the weld pool while shaping the arc and heat input. Argon is the most common shield gas for TIG welding because it provides a stable, clean arc and good weld quality across many metals. Mixing in helium increases the arc energy, boosting heat input and penetration, which is helpful for thicker sections or harder-to-w Welds. Therefore a blend of argon and helium gives you adjustable heat and penetration, making it the typical and best choice for GTAW-P. Using oxygen or nitrogen would contaminate the weld and promote oxidation or porosity, hydrogen-argon blends are not standard due to safety and defect risks, and neon with helium isn’t a practical, widely used shield gas for these applications.