Which numbers represent electrodes that operate in DCEP?

In welding, particularly with regard to the operation of electrodes, the classification of direct current electrode polarity is essential. Electrodes operating in Direct Current Electrode Positive (DCEP) create a specific arc characteristic conducive to certain welding processes. The classification of electrodes in the range of 1 through 6 represents those that are designed to function optimally under DCEP conditions.

When an electrode operates on DCEP, the flow of current allows for better weld penetration while also aiding in the stabilization of the arc. This is particularly beneficial when using specific types of consumable electrodes that require a greater heat concentration at the workpiece for effective bonding. The electrodes in this range are designed to function under these parameters, ensuring efficient heat transfer and better performance in various steel welding applications.

Other ranges of electrode classifications do not exhibit the requisite properties associated with DCEP operation, which is why they do not fit the criterion for this question. Understanding electrode polarity and its influence on welding quality is crucial for selecting the appropriate materials and processes in structural welding.