S125451-035 - Hobart Hoballoy E8018-B2 5/32" Stick Electrode 50lb Can

Technical Overview of Hobart Hoballoy 8018-B2

The Hobart Hoballoy 8018-B2 is a premium Shielded Metal Arc Welding (SMAW) electrode designed specifically for the joining of low-alloy steels containing approximately 1.25% Chromium and 0.5% Molybdenum. This chemical composition is critical for applications requiring creep resistance and high tensile strength at elevated temperatures. Classified under AWS A5.5 as E8018-B2, this electrode is engineered to deliver a weld deposit that maintains structural integrity in high-heat service environments, making it a standard choice for the fabrication and repair of boilers, pressure vessels, and associated high-pressure piping systems.

One of the defining technical characteristics of the Hoballoy 8018-B2 is its advanced flux coating formulation. The coating is designed to be low-hydrogen and moisture-resistant, a crucial factor when welding high-strength low-alloy (HSLA) steels. Moisture absorption in the flux can lead to the introduction of hydrogen into the weld pool, significantly increasing the risk of hydrogen-induced cracking (HIC) or under-bead cracking. Hobart’s formulation mitigates this risk by resisting moisture pick-up even under conditions of high relative humidity, thereby ensuring the mechanical properties of the weld meet stringent code requirements. The electrode produces a deposit with a minimum tensile strength of 80,000 psi, aligning with the base metal properties of Grade 11 and Grade 12 Cr-Mo steels.

Operability is another key focus of the Hoballoy 8018-B2 design. It functions effectively on both Direct Current Electrode Positive (DCEP) and Alternating Current (AC), providing flexibility for various power source configurations. The 5/32-inch diameter is suitable for filling and capping passes on thicker wall sections often found in power generation and petrochemical infrastructure. The electrode exhibits excellent arc stability and wetting action, which helps in eliminating starting porosity—a common defect that can lead to costly rework in radiographic-quality welds. The slag system is formulated for easy detachment, facilitating faster inter-pass cleaning and reducing the likelihood of slag inclusions in multi-pass weldments.

This product is supplied in a 50-pound hermetically sealed can, ensuring the electrodes remain factory-dry until the point of use. For optimal performance and code compliance, it is recommended to store opened containers in a rod oven at elevated temperatures to maintain the low-hydrogen status of the coating. The Hoballoy 8018-B2 represents a reliable, high-performance solution for engineers and fabricators dealing with the challenges of welding chrome-moly alloy steels.