EX309LSI-035M - Exocor ER309LSi .035 MIG Wire 33lb Spool

Premium Stainless Steel Wire for Dissimilar Joining

The Exocor ER309LSi .035" MIG Wire is a high-quality austenitic stainless steel consumable designed for the rigorous demands of industrial fabrication. This wire is formulated with a higher silicon content than standard ER309L, a modification that significantly enhances the fluidity of the molten weld pool. In professional environments where weld integrity and bead profile are critical, the improved wetting action of the LSi grade ensures smooth transitions at the weld toes, reducing the need for post-weld grinding and finishing.

This alloy is primarily engineered for joining dissimilar metals, specifically stainless steels (such as Type 304 or 316) to carbon or low-alloy steels. It is also the industry standard for applying buffer layers on carbon steel prior to cladding with 308 or other stainless alloys. The "L" in the designation indicates a low carbon content (maximum 0.03%), which is essential for preventing carbide precipitation during the welding process. This feature maintains the corrosion resistance of the weldment and protects against intergranular corrosion, ensuring long-term structural durability in harsh environments.

Packaged in a 33lb (15kg) spool, this wire is intended for high-volume production environments utilizing industrial wire feeders. The precision layer winding prevents tangles and ensures consistent wire payout, which is crucial for maintaining arc stability and preventing burn-backs during extended welding sessions. Whether used in petrochemical piping, heat exchanger fabrication, or general heavy equipment repair, the Exocor ER309LSi delivers reliable, defect-free welds with excellent mechanical properties.

Technical Specifications

The wire meets AWS A5.9 classifications and is suitable for use with Direct Current Electrode Positive (DCEP) polarity. Recommended shielding gases include Argon/CO2 blends (with low CO2 content to prevent carbon pickup) or Argon/Oxygen mixtures for optimal arc stability and spray transfer modes.