* E: Indicates that it's an electrode.
* 70: Represents the minimum tensile strength of the weld metal, which is 70,000 psi (pounds per square inch).
* 18: This number designates the specific type of electrode, indicating the following characteristics:
* 1: Indicates a low hydrogen electrode. This means it has a low moisture content, making it suitable for welding critical applications where hydrogen cracking is a concern.
* 8: Indicates a specific flux coating containing iron powder. This coating provides excellent arc stability and slag removal, making it a versatile electrode.
Therefore, E-7018 represents a low hydrogen, iron-powder-coated electrode with a minimum tensile strength of 70,000 psi, suitable for welding various steels, including high-strength steels and low-alloy steels.