S526808-I26 - Hobart ER308LSi .035" Stainless MIG Wire (30lb Spool)

Technical Overview of Hobart ER308LSi Stainless Steel MIG Wire

The Hobart ER308LSi is a premium austenitic stainless steel solid wire designed for the Gas Metal Arc Welding (GMAW) process. This filler metal is formulated with a nominal composition of 20% chromium and 10% nickel, making it chemically compatible with AISI 304 and 304L base metals. The distinguishing feature of the "Si" classification is the elevated silicon content, typically ranging between 0.65% and 1.00%. This modification is critical for industrial applications requiring superior weld pool fluidity and wetting characteristics.

Metallurgically, the increased silicon acts as a deoxidizer and lowers the surface tension of the molten weld pool. This results in improved "wash-in" at the toes of the weld, significantly reducing the likelihood of cold lap or undercut, particularly in fillet welds. The "L" designation indicates a low carbon content (maximum 0.03%), which is essential for minimizing carbide precipitation during the welding thermal cycle. This feature preserves the corrosion resistance of the weldment and protects against intergranular corrosion, a common failure mode in stainless steel fabrication.

This 0.035-inch diameter wire is precision-wound on a 30-pound spool, suitable for industrial wire feeders. It operates on Direct Current Electrode Positive (DCEP) and performs optimally with shielding gas mixtures such as 98% Argon/2% Oxygen or Argon/CO2 blends. The wire produces a ferrite number typically in the range of 8-12, providing excellent resistance to hot cracking while maintaining ductility. It is an ideal choice for high-speed automated welding or manual applications where bead aesthetics and profile consistency are paramount.

Key Technical Specifications:

• AWS Classification: ER308LSi
• Base Metal Compatibility: 304, 304L, 308, 308L, 321, 347
• Tensile Strength: Typically 85,000 - 87,000 PSI
• Elongation: ~40%
• Charpy V-Notch: Excellent toughness at cryogenic temperatures