S119844-045 - Hobart 18AC E7018 Stick Electrode 1/8 Inch 5lb Pack

Hobart 18AC E7018 Stick Electrode: Optimized for AC Stability

The Hobart® 18AC is a specialized Shielded Metal Arc Welding (SMAW) electrode designed to bridge the gap between industrial low-hydrogen requirements and the capabilities of standard utility power sources. While traditional E7018 electrodes typically require Direct Current Electrode Positive (DCEP) and significant Open Circuit Voltage (OCV) for stable operation, the 18AC formulation includes specific arc stabilizers that allow it to perform exceptionally well on Alternating Current (AC). This makes it an indispensable consumable for fabrication environments relying on AC buzz boxes or older transformer-rectifier machines that may lack the smooth DC output of modern inverters.

Classified as an AWS E7018 H8, this electrode delivers the mechanical properties expected of a low-hydrogen rod—specifically a minimum tensile strength of 70,000 psi—while offering superior resistance to hydrogen-induced cracking. This is particularly critical when welding low, medium, and high-carbon steels where rapid cooling or hydrogen entrapment can compromise weld integrity. The "H8" designation indicates a diffusible hydrogen content of less than 8ml per 100g of weld metal, ensuring code-quality results in general fabrication and structural repair scenarios.

The 1/8-inch (3.2 mm) diameter is a versatile size for medium-to-heavy plate applications. The electrode features an iron powder coating which assists in deposition rates and produces a fluid puddle that is manageable in all positions, including vertical-up and overhead. The slag system is designed for easy removal, reducing post-weld cleanup time. Packaged in a durable 5 lb (2 kg) plastic pak, these electrodes are protected from immediate environmental moisture, although standard low-hydrogen storage practices (rod ovens) are recommended for critical code work once the package is opened.

For MRO professionals and industrial fabricators, the Hobart 18AC offers a reliable solution for tack welding and skip welding, where frequent restrikes are necessary. Its ability to run on AC, DCEN, and DCEP provides maximum flexibility across different machine fleets, ensuring that maintenance teams can achieve high-quality, crack-resistant welds regardless of the power source available in the field.