What is one of the main purposes of using a gas lens?

One of the main purposes of using a gas lens in Gas Tungsten Arc Welding (GTAW) is to enhance gas flow and improve shielding. A gas lens consists of a specialized diffuser that helps to stabilize and direct the flow of shielding gas around the weld area. This stabilization is crucial for preventing contamination and oxidation, which can negatively affect the quality of the weld. By producing a more uniform gas coverage, the gas lens ensures that the weld area is adequately protected from atmospheric gases such as nitrogen and oxygen, thereby leading to cleaner and stronger welds.

Using a gas lens also helps to minimize turbulence in the gas flow. This results in less spatter and helps maintain the desired weld characteristics. As a result, welds can have better penetration and improved overall appearance, crucial factors for many applications.

The other options do not align with the primary function of a gas lens in GTAW.