Why is it recommended to use a flow meter in a GTAW setup?

Using a flow meter in a Gas Tungsten Arc Welding (GTAW) setup is crucial for allowing precise control of gas flow rates. This is particularly important because the shielding gas plays a vital role in protecting the weld pool and tungsten electrode from contamination and oxidation. A specific flow rate ensures that the gas shield adequately covers the welding area, preventing atmospheric gases from adversely affecting the weld quality.

Setting the flow rate too high can create turbulence, potentially disrupting the shielding effect, while too low of a rate may not provide sufficient protection, leading to defects such as porosity or poor arc stability. Therefore, the flow meter helps technicians adjust and maintain optimal gas flow, ensuring consistent and high-quality weld outcomes.

The other options provided do not relate to the primary purpose of a flow meter in a GTAW setup. For instance, increasing the gas flow rate without precision could negatively impact weld quality, and measuring temperature of the electrode or determining material thickness falls outside the scope of a flow meter's function. The essence of utilizing a flow meter lies in its ability to provide a controlled and accurate measurement of gas flow, thus aligning with the specific needs of GTAW processes.