What is the classification of electrodes in SMAW identified as E-7018 primarily based on?

The classification of electrodes in Shielded Metal Arc Welding (SMAW), such as E-7018, is primarily based on the minimum tensile strength of the welded joint. In the designation "E-7018," the number "70" indicates a minimum tensile strength of 70,000 psi. This classification system provides essential information regarding the mechanical properties of the electrode, enabling welders to select the appropriate electrode for specific applications. The other components of the designation, such as the "E," signify that it is an electrode, and the "18" indicates the type of coating and its usability characteristics. Understanding this classification allows welders to ensure that the electrode used meets the strength requirements of the base materials they are working with and the conditions under which the weld will be subjected to stress.