Which dc electrical polarity DCEN or DCEP requires a larger electrode diameter and why?

Direct Current Electrode Negative (DCEN) typically requires a larger electrode diameter compared to Direct Current Electrode Positive (DCEP). This is because DCEN focuses more heat on the workpiece, leading to deeper penetration, but it can also result in increased wear on the electrode. A larger diameter helps sustain the required current and thermal stability, ensuring effective welding without excessive electrode consumption. DCEP, on the other hand, tends to work with smaller diameters as it provides better arc stability and less heat concentration on the electrode.