S512537-017 - Hobart ER308/308L Stainless Steel TIG Rod - 3/32 in x 36 in (Tube)

Technical Overview of Hobart ER308/308L TIG Filler Metal

The Hobart ER308/308L is a premium austenitic stainless steel TIG (GTAW) welding rod designed for joining base metals of similar composition, such as AISI 304, 304L, 308, and 308L. This filler metal is manufactured to meet the rigorous requirements of AWS A5.9 specifications, ensuring consistent chemistry and mechanical properties. The "L" designation indicates a low carbon content (maximum 0.03%), which is critical for minimizing carbide precipitation during the welding process. This feature significantly enhances the weld's resistance to intergranular corrosion, making it suitable for applications where the weld zone will not be annealed after fabrication.

With a diameter of 3/32 inch (approx. 2.4mm), this rod is optimally sized for welding material thicknesses ranging from 1/16 inch to 1/4 inch, depending on joint configuration and amperage settings. The chemical composition typically includes 19.5-22.0% Chromium and 9.0-11.0% Nickel, providing a microstructure that balances strength with ductility. The ferrite number is controlled to prevent hot cracking while maintaining excellent cryogenic toughness and corrosion resistance in oxidizing environments.

This product is supplied in 36-inch cut lengths, straightened and cleaned to remove surface contaminants such as drawing lubricants and oxides. This level of surface preparation is essential for high-quality TIG welding, where even minor impurities can lead to porosity or inclusions. The rods are packaged in a durable tube to maintain straightness and protect against atmospheric moisture and shop floor contamination. Welders utilizing DCEN (Direct Current Electrode Negative) with 100% Argon shielding gas will experience a stable arc, minimal spatter, and excellent bead aesthetics.

Industries utilizing this filler metal include petrochemical processing, food and beverage equipment manufacturing, pharmaceutical vessel fabrication, and architectural structures. Its versatility in handling both standard 308 and low-carbon 308L applications allows fabrication shops to consolidate inventory without compromising on weld quality or code compliance.