S125644-033 - Hobart Hoballoy 9018-M 1/8" Stick Electrode - 10lb Can

Technical Overview of Hobart Hoballoy 9018-M

The Hobart Hoballoy 9018-M is a premium low-alloy steel electrode designed for Shielded Metal Arc Welding (SMAW) applications requiring high tensile strength and superior toughness. Classified under AWS A5.5 as E9018-M, this consumable is engineered to produce weld deposits with a minimum tensile strength of 90,000 psi. The electrode features a low-hydrogen, iron powder coating that facilitates high deposition efficiency while strictly controlling diffusible hydrogen levels to prevent hydrogen-induced cracking (cold cracking) in the heat-affected zone (HAZ).

Metallurgically, the "M" suffix indicates a specific alloy composition, typically involving manganese and molybdenum, designed to meet rigorous military and industrial specifications. This composition ensures that the weld metal retains excellent Charpy V-Notch impact properties even at sub-zero temperatures, making it suitable for critical structural applications subject to dynamic loading and harsh environments. The 1/8-inch (3.2mm) diameter offers a versatile operating range of approximately 110 to 150 amperes, allowing for effective penetration and fusion in various joint configurations.

Storage and handling are critical for E9018-M electrodes. This product is packaged in a 10 lb hermetically sealed can to maintain the factory-low moisture content of the coating. Upon opening, it is imperative to follow standard low-hydrogen practices; if not used immediately, electrodes should be stored in a holding oven at temperatures typically between 250°F and 300°F to prevent moisture pickup from the atmosphere, which could compromise the hydrogen control and lead to porosity or cracking.

This electrode is compatible with both Direct Current Electrode Positive (DCEP) and Alternating Current (AC) power sources, providing flexibility for various shop and field power supplies. The formulation is optimized to provide a stable arc, minimal spatter, and a slag system that is easily detachable, reducing post-weld cleaning time and improving overall productivity in high-specification fabrication environments.