What happens if the weld pool is not properly covered by shielding gas?

When the weld pool is not properly covered by shielding gas, it can lead to oxidation and defects in the weld. The primary function of shielding gas in Gas Tungsten Arc Welding (GTAW) is to protect the molten weld pool from atmospheric contamination, specifically oxygen and nitrogen. If this protection is compromised, these elements can react with the molten metal, resulting in oxidation. This reaction can manifest as discoloration, porosity, or inclusions within the weld, ultimately compromising its integrity and strength.

Additionally, defects caused by improper shielding may affect the overall aesthetic and performance characteristics of the weld, leading to potential failures in the joint under stress. The importance of sufficient shielding gas coverage cannot be overstated, as it directly contributes to the quality and durability of the finished weld.