E2209-15 describes a specific type of AWS basic-coated electrode used for welding duplex stainless steels, depositing an austenitic-ferritic weld metal with high strength, excellent resistance to pitting and stress corrosion cracking, and good impact toughness at low temperatures, ideal for applications in chemical and offshore industries.
Composition: Deposits a weld metal with ~22% Chromium, ~9% Nickel, ~3% Molybdenum, and Nitrogen, creating a duplex (mixed) structure.
Performance: Offers high tensile strength, excellent ductility, smooth arc, spatter-free welding, and easy slag removal.
Corrosion Resistance: Very good resistance to pitting and chloride stress corrosion cracking.
Applications: Joining duplex stainless steels like 2205 (UNS S31803/S32205), especially in demanding environments like the chemical, petrochemical, and offshore industries.
Welding Conditions: Typically used with DCEP (Direct Current Electrode Positive) or AC, recommended for specific heat inputs to maintain phase balance.
In essence, E2209-15 provides a strong, corrosion-resistant weld for duplex stainless steels, combining high mechanical properties with superior corrosion resistance, making it a go-to choice for critical applications.
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