100999 - CWI ER309LSi .030" Stainless MIG Wire - 2lb Spool

Versatile 309LSi Wire for Dissimilar Metals

Tackle your toughest mixed-metal welding projects with confidence using the Central Wire ER309LSi .030" MIG Wire. Packaged in a compact 2-pound spool, this consumable is perfect for shop use or field repairs where portability is key. The 309LSi classification is the industry standard for welding stainless steel (such as 304 or 316) to carbon steel or low-alloy steels. It provides a ductile, crack-resistant weld deposit that accommodates the different expansion rates of the two base metals.

What sets the 309LSi apart is its high silicon formulation. The increased silicon acts as a deoxidizer and improves the fluidity of the weld puddle. For the welder, this translates to exceptional arc stability and a weld bead that wets out smoothly into the base metal edges. This is particularly beneficial when welding fillet welds or working in positions where bead shape control is critical. The low carbon content protects against sensitization, ensuring your welds remain durable and corrosion-resistant over time.

This solid wire is designed for the Gas Metal Arc Welding (GMAW) process and performs best with DCEP (Direct Current Electrode Positive) polarity. It requires an external shielding gas, typically a mix of Argon and CO2 (e.g., 98/2 or 90/10) or a tri-mix for optimal performance. Central Wire's precision layer winding prevents tangles and snags, allowing for uninterrupted welding and higher productivity. Upgrade your stainless welding capabilities with this premium filler metal.

Common Applications

• Automotive exhaust repair and modification
• Industrial machinery maintenance
• Joining stainless brackets to mild steel frames
• Overlaying carbon steel for corrosion resistance