What is the recommended flow rate of shielding gas for GTAW?

The recommended flow rate of shielding gas for Gas Tungsten Arc Welding (GTAW) being in the range of 10 to 25 cubic feet per hour (CFH) is based on ensuring adequate protection of the weld pool from atmospheric contamination while avoiding excessive turbulence that could disrupt the shielding effect. This flow rate is suitable for most GTAW applications, effectively shielding the weld area from oxidation and other atmospheric gases that could lead to defects.

Too low of a flow rate might not provide sufficient coverage, leaving the weld susceptible to contamination, which can cause issues such as porosity or compromised weld integrity. Conversely, a higher flow rate may create turbulence in the shielding gas, potentially leading to the entrapment of air into the weld pool, which can also cause defects. Thus, maintaining a flow rate within the range of 10 to 25 CFH strikes a balance that optimizes the shielding effect without introducing adverse conditions into the welding environment.