S540458-033 - Hobart Hardalloy 118 Hardfacing Stick Electrode 3/16 Inch

Technical Overview of Hobart Hardalloy 118

The Hobart Hardalloy 118 is a specialized Stick (SMAW) electrode designed specifically for the maintenance and repair of austenitic manganese steel components. As a work-hardening alloy, it offers unique metallurgical properties that make it indispensable in heavy industrial applications such as mining, construction, and railroad maintenance. Unlike standard hardfacing electrodes that rely solely on deposited hardness, the Hardalloy 118 deposit starts with a tough austenitic structure that rapidly hardens upon impact, providing exceptional wear resistance in dynamic environments.

Metallurgical Properties and Performance

This electrode deposits an austenitic manganese steel alloy that is formulated to join and build up manganese steel parts. It is crucial to note that this product is intended for manganese steels only and is not a general-purpose hardfacing rod for mild steel without specific procedures. The key characteristic of the Hardalloy 118 is its ability to work-harden. Under heavy impact conditions—such as rock crushing or railroad crossings—the surface of the weld deposit transforms, becoming significantly harder and more wear-resistant while the underlying material remains tough and ductile. This combination prevents cracking and spalling, common failure modes in high-impact applications.

Operational Specifications

The Hardalloy 118 3/16-inch electrode operates effectively on both Direct Current Electrode Positive (DCEP) and Alternating Current (AC). This versatility allows it to be used with a wide range of power sources, from shop-based rectifiers to field-ready engine drives. The electrode is designed for use in Flat, Horizontal, and Vertical Up positions, providing flexibility for repairs on large, immovable equipment. The 3/16-inch (4.8 mm) diameter allows for high deposition rates, making it efficient for filling large voids or building up extensive worn surfaces on heavy machinery.

Storage and Packaging

Supplied in a 10 lb (4.5 kg) hermetically sealed can, the Hardalloy 118 is protected from moisture absorption, which is critical for maintaining weld quality and preventing porosity. Proper storage ensures that the electrodes are ready for immediate use in harsh field environments where humidity control might otherwise be a challenge.