What must the electrode withstand during operation?

The correct choice indicates that the electrode must withstand the maximum rated current during operation. This is essential because each electrode is designed to perform optimally at a specific range of electrical current. When operating at the maximum rated current, the electrode can provide the required melting rate, penetration, and bead profile needed for a successful weld.

Using the electrode at or near the maximum rated current ensures that it effectively melts and fuses the base metals together without compromising the integrity or quality of the weld. If an electrode is not capable of handling its maximum rated current, it may overheat, resulting in premature wear, excessive spatter, or an inconsistent arc, ultimately leading to unsatisfactory welds.

Understanding the importance of current ratings helps welders select the appropriate electrode for their application and ensures that they can achieve the desired welding outcomes while maintaining safety and efficiency in their work.