What means of 308 in E308-16?

In the designation E308-16, the "308" refers to the specific composition of the filler metal used in welding. It indicates the chemical analysis and mechanical properties of the electrode, which is primarily used for welding austenitic stainless steels. The "16" specifies the minimum tensile strength of the weld metal, which is typically around 70,000 psi. Together, these designations help ensure compatibility and performance in various welding applications.