Describe a key feature of DCEN in GTAW.

In Gas Tungsten Arc Welding (GTAW), using Direct Current Electrode Negative (DCEN) is significant because it facilitates deeper penetration into the base metal. This is primarily due to the dynamics of the arc and the heat source in the welding process. When DCEN is employed, the heat generation occurs mainly at the workpiece, as the negative electrode (tungsten) allows for greater heat transfer efficiency to the base metal. Therefore, this increased heat can penetrate deeper, making it suitable for joining thicker sections of metal where a strong and thorough weld is necessary.

This characteristic of DCEN is invaluable in applications requiring high strength and robust welds, particularly in various industrial sectors. While the other choices discuss limitations or attributes that do not align with DCEN's functionality, the ability to achieve deeper penetration stands out as a defining feature in enabling effective welding outcomes.