Deep penetrating electrodes typically end in which numbers?

Deep penetrating electrodes, such as those used in shielded metal arc welding (SMAW), are identified by their classification numbers according to the American Welding Society (AWS) specifications. The classification system indicates various characteristics of the electrodes, including their chemical composition and the type of coating used.

The numbers that indicate deep penetration are typically found at the beginning or end of the electrode classification. In this system, electrodes ending in '0' and '1' are known for their excellent penetration characteristics. For instance, the 'E7010' and 'E7018' electrodes both provide deep penetration, which is advantageous in applications requiring strong root passes and effective welds in thicker materials.

The other options do not denote electrodes known for deep penetration. These options may refer to other categories or characteristics of electrodes used for different welding processes or applications. Therefore, the identification of deep penetrating electrodes specifically as those ending in '0' and '1' underscores their suitability for challenging welding conditions where greater depth of fusion is required for strength and integrity.