Which of the following describes the primary function of a shielding gas?

The primary function of a shielding gas in gas tungsten arc welding (GTAW) is to prevent oxidation and contamination of the weld area. When welding, exposed molten metal is susceptible to reactions with atmospheric gases, particularly oxygen and nitrogen, which can lead to defects such as porosity, inclusions, and weakened weld integrity. The shielding gas forms a protective barrier around the weld pool, displacing these harmful atmospheric gases and ensuring that the weld is produced in a clean environment. This is crucial for achieving high-quality welds, especially when working with materials that are sensitive to oxidation, such as aluminum and stainless steel.