What is the difference between a gas lens and a standard cup in GTAW?

A gas lens is designed to improve the flow and distribution of shielding gas around the tungsten electrode and the weld zone, which is crucial in Gas Tungsten Arc Welding (GTAW). By creating a more uniform and stable gas coverage, a gas lens minimizes contamination and oxidation of the weld area, leading to a cleaner and higher-quality weld. This is particularly beneficial when working with materials that are sensitive to composition changes, as it helps maintain a consistent atmosphere around the arc, enhancing the overall welding process.

In contrast, a standard cup may not provide the same level of gas distribution, potentially leading to areas where the shielding gas coverage is insufficient. This could result in increased contamination of the weld pool and adversely affect the weld's mechanical properties.

The other options refer to aspects that do not fundamentally differentiate the operational purpose of a gas lens compared to a standard cup. For example, the voltage capabilities or maintenance requirements may vary depending on other factors such as the equipment used and the specific welding conditions, but they do not directly pertain to the inherent function of the gas lens as compared to a standard cup.