What wire diameter is the Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire available in?

The Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire is available in .035 diameter. Wire diameter selection depends on base metal thickness and travel speed requirements: .023 in suits thin sheet metal (up to 3/16 in), .030 in is versatile for 1/8–1/4 in, .035 in is the most common all-purpose diameter for 3/16–1/2 in steel, and .045 in or larger suits heavy plate and high-deposition applications.

What shielding gas or flux type does the Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire require?

Stainless steel MIG wire typically uses 98% Ar/2% O2 or tri-mix (He/Ar/CO2) shielding gas. For Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire: AWS ER309Si applications — 308L suits 304/308 stainless; 309L suits dissimilar metal joints; 316L adds molybdenum for corrosion resistance in marine and chemical environments; 317L provides higher molybdenum content than 316L. Always use the correct filler alloy for your base metal to maintain corrosion resistance across the weld zone.

What is the deposit strength of the Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire?

For ER309Si: Deposit tensile strength for mild steel solid MIG wire (ER70S-x) is approximately 70,000 PSI (483 MPa) minimum. For stainless filler metals, the deposit strength matches the base alloy grade. For flux-core wires, strength and chemistry vary by classification — refer to the AWS classification on the package for the exact mechanical property requirements.

What spool size is the Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire available in?

The Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire is available in 25 lb, 33 lb, 500 lb spool/coil sizes. Smaller spools (2 lb, 10 lb) fit most hobby and light commercial feeders. Larger spools (33 lb, 44 lb) are standard for production welders with 12 in spool capacity. Drums and coils (250–600 lb) are used with bulk drum feeders for robotic and high-production applications.

How should I store the Lincoln Blue Max 309LSi 0.035 inch GMAW Welding Wire to prevent weld quality issues?

Store MIG wire in a clean, dry location away from humidity. Moisture absorption causes porosity in the weld — mild steel wire is particularly susceptible. If wire has been exposed to moisture, it may show surface rust; lightly rusted wire can sometimes be used but should be wiped before feeding. Flux-core and low-hydrogen electrodes require stricter moisture control than solid wire. Keep spools in their original packaging or sealed containers with desiccant packets when not in use.

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Lincoln Electric MIG Wire 0.035"

SKU: ED023962

$500.93 ~~$510.50~~

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BLUE MAX® MIG 309LSi designed for joining stainless steel to mild or low alloy steel. The same composition as Blue Max® MIG 309L with higher silicon content to improve the bead appearance and increase welding ease.

Overview

BLUE MAX® 309L 0.035 inch Stainless Steel MIG Welding Wire is a premium austenitic stainless steel filler metal engineered for joining stainless steel to itself or to carbon and low-alloy steels. Designed for high-performance dissimilar metal welding, this wire delivers excellent metallurgical compatibility and can be used in service temperatures up to 700°F (371°C). Its low carbon content (0.03% max) significantly improves resistance to intergranular corrosion, making it ideal for structural, industrial, and fabrication applications requiring long-term durability.

Features

Q2 Lot® Certified Quality – Certified Material Test Reports available online showing actual wire chemistry, country of origin, and calculated ferrite number (FN) for each lot
Superior Feedability – Proprietary surface lubricant ensures smooth wire feeding and stable arc performance at high wire feed speeds
Enhanced Puddle Control – Elevated silicon content improves weld puddle fluidity and toe wetting for clean, consistent bead profiles
Controlled Ferrite Content – Optimized ferrite balance delivers excellent crack resistance and maximum corrosion resistance
Reduced Post-Weld Cleanup – Smooth weld contour minimizes grinding and finishing time
Low Carbon Chemistry – Improved resistance to intergranular corrosion in demanding service environments

Typical Applications

Dissimilar metal welding of stainless steel to mild steel or low-alloy steel
Structural and industrial fabrication requiring corrosion-resistant welds
High-productivity welding applications with elevated wire feed speeds

Welding Positions

Shielding Gas

98% Argon / Balance O₂
90% Helium / 7.5% Argon / 2.5% CO₂

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Blue Max MIG 309LSi Product Info

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Q&A

Product Overview

Features

Q2 Lot® Certified Quality – Certified Material Test Reports available online showing actual wire chemistry, country of origin, and calculated ferrite number (FN) for each lot
Superior Feedability – Proprietary surface lubricant ensures smooth wire feeding and stable arc performance at high wire feed speeds
Enhanced Puddle Control – Elevated silicon content improves weld puddle fluidity and toe wetting for clean, consistent bead profiles
Controlled Ferrite Content – Optimized ferrite balance delivers excellent crack resistance and maximum corrosion resistance
Reduced Post-Weld Cleanup – Smooth weld contour minimizes grinding and finishing time
Low Carbon Chemistry – Improved resistance to intergranular corrosion in demanding service environments