Which last number of electrodes operates on DC negative and AC?

The last number of electrodes that operate on DC negative and AC is 2. In the context of welding electrodes, the last digit of the specification indicates the polarity that the electrode can operate with.

Electrodes with the last digit of '2' are designed for use with both direct current negative (DC-) and alternating current (AC). This versatility allows them to be used for a variety of welding tasks, making them suitable for different welding processes and materials.

Understanding this aspect is essential for selecting the right electrode depending on the application and the equipment available, as using the correct polarity can affect weld quality and performance. This factor plays an important role in ensuring quality and consistency in welding across various fields and materials.