EXCU0000000620T - Exocor ER2209 Duplex Stainless TIG Rod 1/16" (10lb Box)

Exocor ER2209 TIG Welding Rod - 1/16" x 36"

The Exocor ER2209 is a premium quality solid TIG welding rod classified under AWS A5.9. It is the standard filler metal choice for welding duplex stainless steels, most notably alloy 2205 (UNS S31803/S32205). This 10 lb box of 1/16" (1.6mm) cut lengths provides professional welders with the material needed for high-integrity joining in demanding industrial sectors such as oil and gas, petrochemical, and marine engineering. The rod is characterized by its high chromium (22.5%) and molybdenum (3.0%) content, which are critical for achieving the Pitting Resistance Equivalent Number (PREN) required for severe service conditions.

Duplex stainless steels derive their name from their dual-phase microstructure, consisting of approximately equal parts ferrite and austenite. The ER2209 filler metal is over-alloyed with nickel compared to the base metal to ensure the correct phase balance in the as-welded condition. Without this specific chemistry, rapid cooling after welding could result in a highly ferritic weld bead with poor toughness and reduced corrosion resistance. This rod is engineered to solve that metallurgical challenge, providing a weld deposit that is tough, ductile, and highly resistant to chloride-induced stress corrosion cracking (SCC).

In addition to welding duplex steels to themselves, ER2209 is frequently used for dissimilar welds, such as joining duplex stainless steel to carbon steel or low-alloy steels. The 1/16" diameter is versatile for root passes in pipe welding or for thin-wall tubing applications where precise heat input control is necessary. Welders will appreciate the smooth flow and stable arc characteristics of this Exocor product, which helps in maintaining the strict interpass temperature controls often required when welding duplex alloys.

Technical Specifications & Performance:

• AWS Classification: ER2209 / AWS A5.9.
• Alloy Composition: Cr ~22.5%, Ni ~8.5%, Mo ~3.0%, N ~0.15%.
• Mechanical Properties: Typical tensile strength exceeds 100,000 PSI (690 MPa) with elongation around 25%.
• Shielding Gas: 100% Argon is recommended for TIG welding to prevent nitrogen loss and oxidation.
• Applications: Chemical tankers, desalination plants, flue gas desulfurization (FGD) systems, and subsea pipelines.