S527512-I26 - Hobart ER309LSi .045 Stainless Steel MIG Wire - 30lb Spool

Premium Hobart 309LSi Stainless Steel MIG Welding Wire

The Hobart 309LSi (Hi Sil) .045" MIG Welding Wire is a high-performance austenitic stainless steel filler metal designed for critical industrial applications. Engineered with a modified 309L chemistry, this wire features an increased silicon content (0.65-1.00%) which significantly alters the fluid dynamics of the weld pool. In professional fabrication environments, the "sluggish" nature of standard 300-series stainless steel puddles can lead to poor tie-in and crowned bead profiles. The HiSil formulation overcomes this by lowering surface tension, promoting superior wetting action at the toes of the weld, and resulting in a flatter, smoother bead appearance that requires less post-weld finishing.

This wire is the definitive choice for joining dissimilar metals, specifically for welding carbon steels or low-alloy steels to stainless steels. It is also extensively used for depositing buffer layers on carbon steel prior to cladding with 308 or 316 grades. The "L" designation indicates a low carbon content (maximum 0.03%), which is crucial for preventing carbide precipitation during the welding process. This resistance to sensitization ensures the weldment maintains high corrosion resistance and mechanical integrity, even in service environments subject to intergranular corrosion risks.

Packaged in a 30lb spool, this 0.045-inch diameter wire is optimized for higher deposition rates and thicker base materials often found in heavy fabrication, petrochemical plants, and power generation facilities. It operates on DCEP polarity and is compatible with various shielding gas mixtures, including Argon/Oxygen and Argon/CO2 blends, offering versatility across different welding setups. Whether used in the food and beverage industry for tank fabrication or in general manufacturing for structural transitions, Hobart 309LSi delivers consistent feedability, stable arc characteristics, and X-ray quality welds.