What is the primary function of Direct Current Straight Polarity (DCSP) in Gas Tungsten Arc Welding?

The primary function of Direct Current Straight Polarity (DCSP) in Gas Tungsten Arc Welding is to concentrate heat on the workpiece. In this mode, the current flows from the tungsten electrode to the workpiece, which means that a greater amount of heat is generated at the surface of the workpiece. This concentrated heat allows for deeper penetration and a more controlled weld pool, making it ideal for welding thicker materials and achieving good fusion in the base metal.

In contrast, while some options mention effects like melting the tungsten or producing spatter, those are not the main functions of DCSP. Rather, they may occur under different circumstances or with different settings. Additionally, DCSP may not be the best choice for certain metals, such as aluminum, which often require alternating current (AC) for effective welding due to the nature of aluminum’s oxide layer and its thermal conductivity.