What type of electrode is a 7018?

A 7018 electrode is classified as both low hydrogen and, in some versions, it contains iron powder. The designation "7018" indicates that the electrode is for use in welding mild steel with a minimum tensile strength of 70,000 psi and that it is suitable for welding in all positions.

The "70" specifies the minimum yield strength in thousands of pounds per square inch, while the “18” indicates the type of coating and its chemical composition. The low hydrogen characteristic is critical because it helps prevent hydrogen embrittlement, which can significantly weaken welds, especially in high-strength steels. This means that the welding process can produce stronger and more reliable welds with less risk of defects.

Iron powder may be added to the flux coating in certain 7018 electrodes to increase the deposition rate and improve the performance of the weld, particularly in flat and horizontal positions. Thus, both characteristics are present in many versions of the 7018 electrode, making the option that states it is both iron powder and low hydrogen correct.