What last number of the electrodes operate on Direct Current Negative (DC-) and Alternating Current (AC)?

The last number on the electrode classification indicates the type of current for which the electrode is designed to operate. In the case of welding electrodes, a last number of 2 signifies that the electrode is suitable for use with both Direct Current Negative (DC-) and Alternating Current (AC). This versatility makes these electrodes suitable for a variety of welding applications, allowing for more flexibility in the welding process.

In contrast, other last numbers correspond to different current types or specific applications. For example, electrodes ending with other numbers might be designed primarily for Direct Current, either positive or negative, or might not be functionally compatible with AC. Therefore, the knowledge of these classifications is essential for welders to select the appropriate electrode for their specific task and ensure optimal welding results.