S670929-002 - Hobart Fabshield 309L-O Self-Shielded Stainless Flux-Core Wire 3/32" 60lb Coil

Technical Performance: Hobart Fabshield 309L-O

The Hobart Fabshield 309L-O (SKU: S670929-002) is a specialized flux-cored arc welding (FCAW) wire formulated for high-performance joining and cladding without the need for external shielding gas. Conforming to AWS E309LT0-3 specifications, this 3/32" diameter wire is supplied in a 60 lb coil, designed for automatic or semi-automatic welding equipment capable of handling larger diameter cored wires. It operates on Direct Current Electrode Positive (DCEP) and is optimized for flat and horizontal welding positions, delivering a stable arc and smooth bead profile.

Metallurgically, the "309L" designation indicates a nominal composition of 24% chromium and 13% nickel with low carbon content. This chemistry is critical when welding dissimilar metals, as it accommodates the dilution from carbon steel base metals without cracking or forming brittle phases. The low carbon content (0.04% max) further minimizes carbide precipitation, preserving the intergranular corrosion resistance of the weldment. This makes the Fabshield 309L-O an exceptional choice for the first pass when cladding carbon steel with stainless steel, providing a sound metallurgical bond and a corrosion-resistant barrier.

Operational efficiency is a hallmark of this product. The 3/32" diameter allows for high current carrying capacity and high deposition rates, far exceeding that of shielded metal arc welding (SMAW) stick electrodes. The flux system is designed to produce a fast-freezing slag that supports the weld puddle while being easily detachable—often self-peeling—after cooling. This feature is particularly beneficial in multi-pass welding scenarios where slag entrapment must be avoided. Welders can expect excellent bead appearance and reliable mechanical properties, including a tensile strength of approximately 85,000 psi and elongation of 35%.

Specifications & Parameters

• AWS Class: E309LT0-3
• Diameter: 3/32" (2.4 mm)
• Polarity: DCEP (Reverse Polarity)
• Shielding Gas: None required (Self-Shielded)
• Alloy Type: Cr-Ni Stainless Steel (309L)