What characteristic of electrodes that operate on DCEN is true?

Electrodes that operate on Direct Current Electrode Negative (DCEN) are known for their efficiency, particularly when welding thicker materials. This characteristic arises from the fact that when using DCEN, the electrode is connected to the negative terminal of the power source, allowing for a higher heat concentration at the workpiece. This increased heat input results in deeper penetration, making it ideal for welding thicker sections where strong, durable welds are required.

Achieving high-quality welds in thicker materials requires not only the right heat input but also controlled arc stability, both of which can be enhanced through the use of DCEN. Additionally, this setup can be beneficial in terms of preventing certain types of defects that are more prone to occur when using other polarities.

In contrast, the other listed characteristics do not apply to electrodes operating with DCEN. The carbon content, charge characteristics, and operational parameters mentioned in the other options do not accurately reflect the advantages or specifications associated with this welding technique.