EX2209125E - Exocor E2209-16 Duplex Stainless Steel Electrode 1/8" (3.2mm) - 10lb Carton

Technical Overview of Exocor E2209-16 Duplex Electrodes

The Exocor E2209-16 is a high-performance coated stick electrode specifically engineered for the Shielded Metal Arc Welding (SMAW) of duplex stainless steels. This consumable is classified under AWS A5.4 as E2209-16 and is designed to deposit weld metal with a duplex microstructure consisting of approximately equal proportions of ferrite and austenite. The chemical composition typically includes 22% Chromium, 9% Nickel, and 3% Molybdenum, often supplemented with Nitrogen to promote austenite formation and enhance pitting resistance.

This electrode is the primary choice for joining 2205 grade duplex stainless steels (UNS S31803 and S32205). The metallurgical properties of the deposited weld metal offer significantly higher tensile strength than standard austenitic stainless steels (such as 304 or 316), often exceeding 100,000 PSI (690 MPa). Furthermore, the E2209-16 formulation provides exceptional resistance to Stress Corrosion Cracking (SCC) in chloride-rich environments and superior resistance to pitting and crevice corrosion, indicated by a high Pitting Resistance Equivalent Number (PREN).

The "-16" coating designation indicates a titania-based flux that supports operation on both Alternating Current (AC) and Direct Current Electrode Positive (DCEP). This coating system ensures a stable arc, fine spray transfer, and a flat to slightly convex bead profile with fine ripples. It is formulated to minimize spatter and facilitate easy slag detachment, which is critical for multi-pass welding applications to prevent slag inclusions. The 1/8-inch (3.2mm) diameter is a versatile size suitable for medium-to-heavy wall thicknesses in pipe and plate fabrication.

Industrial applications for the Exocor E2209-16 are extensive, particularly in sectors requiring robust corrosion protection. Key industries include offshore oil and gas production, where it is used for process piping and manifolds; chemical and petrochemical processing plants; desalination facilities; and the pulp and paper industry for digesters and bleaching equipment. Proper storage and handling are recommended to maintain the low-hydrogen characteristics of the coating and prevent porosity.