S655519-056 - Hobart Fabco 125K4 1/16" Flux-Cored Wire 600lb Drum

Technical Overview of Hobart Fabco 125K4

The Hobart Fabco 125K4 is a premium gas-shielded flux-cored wire engineered specifically for the welding of high-strength, quenched and tempered low-alloy steels. With a diameter of 1/16 inch and packaged in a substantial 600 lb Exacto Pak, this wire is designed for high-volume industrial fabrication environments requiring consistent performance and minimal downtime. It conforms to AWS classification E121T5-K4C H4, indicating its capability to deliver weld deposits with a minimum tensile strength of 120,000 psi while maintaining exceptional toughness.

A defining characteristic of the Fabco 125K4 is its basic slag system. Unlike rutile-based wires, this basic formulation significantly reduces the oxygen content in the weld metal, which directly correlates to improved impact properties at low temperatures (typically down to -60°F). Furthermore, the wire is manufactured to meet H4 diffusible hydrogen levels, minimizing the risk of hydrogen-induced cracking (cold cracking), a critical factor when welding sensitive high-strength low-alloy (HSLA) materials like ASTM A514 and A517.

This wire is formulated for use with 100% CO2 shielding gas, providing deep penetration and reliable fusion. It is designed for flat and horizontal welding positions, making it suitable for heavy structural components where positioning can be controlled. The 600 lb bulk packaging ensures continuous feeding for automated or semi-automated setups, optimizing arc-on time and production efficiency.