What is the purpose of the outer shield in FCAW-GS?

The outer shield in Flux-Cored Arc Welding with Gas Shielding (FCAW-GS) plays a crucial role in protecting the weld from contamination. This shielding acts as a barrier against atmospheric gases, moisture, and other environmental elements that could adversely affect the quality of the weld. By providing this protective environment, the outer shield ensures that the molten weld pool remains clean and free from impurities, which is vital for achieving strong and defect-free welds. Proper shielding is essential for maintaining the integrity of the weld metal and ensuring good mechanical properties in the finished joint.