ED037128 - Lincoln UltraCore 309L P 1/16" Flux-Cored Stainless Wire 33lb

Technical Overview of Lincoln UltraCore® 309L P

The Lincoln Electric UltraCore® 309L P (SKU: ED037128) is a premium gas-shielded, flux-cored stainless steel welding wire designed for high-performance fabrication. Engineered with a nominal diameter of 1/16" (1.6 mm), this consumable meets AWS A5.22 classifications E309T1-1, E309T1-4, E309LT1-1, and E309LT1-4. It is specifically formulated for the joining of dissimilar metals, such as stainless steel to carbon or low-alloy steels, as well as for depositing buffer layers on carbon steel prior to cladding with 308L or other stainless alloys.

The "P" designation in UltraCore® 309L P signifies its optimized performance for all-position welding, providing a flat bead profile even in vertical-up applications. The wire operates on Direct Current Electrode Positive (DCEP) and offers dual gas capability, functioning effectively with either 100% CO2 or a blend of 75% Argon / 25% CO2. This flexibility allows fabricators to balance cost (CO2) with arc characteristics (Argon mix). The flux composition ensures a smooth, stable arc with a fast-freezing slag system that is self-peeling in many instances, significantly reducing inter-pass cleaning time.

Metallurgically, the low carbon content (0.04% max) of the 309L alloy reduces the risk of intergranular corrosion by minimizing carbide precipitation during the welding process. This makes it an excellent choice for applications involving pressure vessels, petrochemical piping, and general heavy fabrication where structural integrity and corrosion resistance are paramount. The wire is precision layer-wound on a 33 lb (15 kg) plastic spool, ensuring consistent wire feeding and electrical contact, which is critical for automated or semi-automated processes. The product is shipped in vacuum-sealed foil packaging to prevent moisture absorption, preserving the low-hydrogen characteristics of the flux core.

Key Technical Specifications:

• AWS Classifications: E309T1-1/4, E309LT1-1/4
• Diameter: 1/16 inch
• Shielding Gas: C1 (100% CO2) or M21 (75% Ar / 25% CO2)
• Typical Ferrite Number: 8-20 (depending on gas)
• Tensile Strength: Typically 85-90 ksi