What type of shielding gas is commonly used in TIG welding to protect the weld area?

Argon is the most commonly used shielding gas in TIG (Tungsten Inert Gas) welding due to its excellent inert properties, which effectively protect the weld area from atmospheric contamination. Argon has a high atomic mass compared to other gases, which allows it to form a stable gas shield that prevents oxidation and other reactions that could weaken the weld or compromise its integrity. Additionally, argon provides a stable arc and better control during the welding process, making it ideal for high-quality welds. While helium can also be used in TIG welding to enhance the heat input for thicker materials, argon remains the primary choice because of its versatility and effectiveness in a wide range of welding applications. On the other hand, krypton is not widely used as a shielding gas in welding, and carbon dioxide is typically associated with MIG welding, where it can be used for its cost-effectiveness but is not suitable for TIG welding applications.