Product Description
Product Overview
Lincoln Electric Blue Max 309LSi MIG Wire is purpose-built for joining stainless steel to mild or low-alloy steels. With higher silicon content than standard 309L, it delivers enhanced puddle fluidity, improved wetting, and smoother welds. It maintains excellent performance at high wire feed speeds and supports both manual and robotic applications.
Key Features
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High silicon levels increase weld puddle fluidity, improving bead appearance and reducing post-weld cleanup.
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Proprietary surface lubricant ensures consistent wire feeding and stable arc behavior, even in high-speed welding.
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Q2 Lot certification provides traceable test reports, including wire composition and ferrite number, ensuring quality and accountability.
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Controlled ferrite levels maximize corrosion resistance, even in dissimilar-metal welds and elevated temperature environments.
Technical Specifications
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AWS/ASME Classification: ER309LSi, ER309Si; ASME SFA-A5.9; CWB/CSA W48-06; EN ISO 14343-B
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Available diameters: 0.030", 0.035", 0.045", and 1/16" (0.8–1.6 mm) in 25 lb and 33 lb plastic spools, with large drum options available
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Typical composition: Carbon ≤0.03%, Chromium ~23.5%, Nickel ~13.7%, Molybdenum ~0.28%, Manganese ~2.0%, Silicon ~0.89%
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Mechanical properties (as-welded): Yield strength ~65 ksi, Tensile strength ~86 ksi, Elongation ~42%, Ferrite number ~11
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Recommended shielding gases:
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Short-circuit transfer: 90% He / 7.5% Ar / 2.5% COâ‚‚
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Axial spray transfer: 98% Ar / 2% Oâ‚‚
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Applications
Blue Max 309LSi is ideal for industrial applications where stainless must be joined to carbon or low-alloy steels, or where superior corrosion resistance is required. Common uses include:
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Fabrication of tanks, piping, and pressure vessels
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Dissimilar metal welding in construction and maintenance
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Automotive, marine, and chemical processing equipment
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High-speed robotic or manual MIG welding in demanding environments
Advantages Over Competitors
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Higher silicon content ensures cleaner welds and smoother bead appearance compared to standard 309L wires
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Q2 Lot traceability guarantees material consistency and weld integrity
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Superior arc stability and feeding performance outperform generic stainless MIG wires on the market
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Meets multiple international welding standards for flexibility and compliance across industries
Why Choose Blue Max 309LSi MIG Wire
Blue Max 309LSi is engineered for welders who demand premium performance, consistency, and reliability. Whether joining stainless to carbon steel, fabricating pressure-bearing equipment, or running high-speed automated welding, this wire delivers the strength and corrosion resistance you can trust in the most demanding environments.
