What does the last digit of an electrode number indicate?

The last digit of an electrode number in the context of the American Welding Society (AWS) classification system provides specific information about the coating properties of the electrode. The digit indicates the type of coating and its characteristics, such as whether it's designed for a specific welding position or has certain properties to enhance welding performance.

For example, in the classification of electrodes like E7018, the "8" signifies that the electrode has a moisture-resistant coating suitable for certain welding conditions. The properties denoted by the last digit help welders select the appropriate electrode for their specific application, improving the quality and performance of the weld.

Understanding this coding system is crucial for welders, as it guides them in making informed choices that align with the requirements of the project they are working on. This focus on coating properties is essential for ensuring the integrity and durability of the weld.