What polarity is typically used for plasma arc cutting?

Plasma arc cutting primarily utilizes direct current electrode negative (DCEN) polarity. This is because with DCEN, the electrons flow from the electrode to the workpiece, which allows for a concentrated heat source. This concentration of heat is essential for effectively melting the material that is being cut. The high-temperature plasma created in this process sufficiently penetrates metals, resulting in a clean and precise cut.

In contrast, if direct current electrode positive (DCEP) were used, the heat would be concentrated more in the electrode rather than the workpiece, which would not be effective for cutting. Alternating current (AC) is also not suitable for plasma arc cutting because it does not provide the stable and consistent arc necessary for precision cutting. Therefore, DCEN is the standard choice for plasma arc cutting due to its optimal heat generation and control over the cutting process.