Which current is primarily used in Tungsten Arc Gas Shielded Welding?

In Tungsten Arc Gas Shielded Welding, commonly referred to as Gas Tungsten Arc Welding (GTAW) or TIG welding, the process utilizes an arc between a non-consumable tungsten electrode and the workpiece. The choice of current type is integral to the welding process because it influences the weld quality and characteristics.

Both AC and DC currents can be effectively used in GTAW, depending on the materials being welded. For instance, DC current is primarily used for welding ferrous metals and non-ferrous metals like aluminum and magnesium. AC current, on the other hand, is particularly advantageous for welding aluminum since it allows for both the cleaning action of the arc and effective heat generation during the welding process. The AC current alternates directions, which helps remove the oxide layer from aluminum, ensuring better penetration and quality of the weld.

The ability to use both types of current makes the process versatile and adaptable to various welding scenarios. Therefore, the option indicating that both AC and DC currents are utilized in Tungsten Arc Gas Shielded Welding is correct, as it reflects the practical applications of the different current types in achieving optimal welding results across a range of materials.