S119844-089 - Hobart 7018AC 1/8" Stick Welding Electrodes

Technical Analysis: Hobart 7018AC Stick Electrode

The Hobart 7018AC is a specialized Shielded Metal Arc Welding (SMAW) electrode designed to overcome the inherent limitations of standard low-hydrogen electrodes when used with Alternating Current (AC) power sources. Standard E7018 electrodes typically require a stable Direct Current (DC) arc or an AC machine with high Open Circuit Voltage (OCV) to maintain ionization. The Hobart 7018AC formulation includes specific arc stabilizers in the flux coating that ensure continuous arc maintenance even as the AC sine wave passes through zero voltage 120 times per second. This makes it the premier choice for fabrication shops and industrial maintenance operations utilizing AC utility welders.

Metallurgically, this electrode deposits high-quality carbon steel weld metal with a minimum tensile strength of 70,000 psi, meeting AWS A5.1 specifications. The coating is a low-hydrogen, iron-powder type, which serves dual purposes: it minimizes the risk of hydrogen-induced cracking in medium-to-high carbon steels and increases the deposition rate compared to non-iron-powder electrodes. The iron powder assists in carrying the current and becomes part of the weld metal, improving efficiency.

This electrode is engineered for all-position welding, including flat, horizontal, vertical, and overhead. It is particularly noted for its operability on AC, DC Electrode Positive (DCEP), and DC Electrode Negative (DCEN), providing maximum versatility for mixed-equipment environments. For code-critical applications, proper storage and handling are essential; as with all low-hydrogen consumables, exposure to atmospheric moisture should be minimized to preserve the hydrogen-controlled characteristics of the deposit. The 3.2mm (1/8") diameter is optimal for welding base metals ranging from 1/8" up to 1/2" in thickness, offering deep penetration and robust fusion.