T308L - ER308L Stainless TIG Welding Rod - 1.6mm (1/16") - 10lb Tube

Technical Overview of ER308L TIG Filler Metal

The Central Wire ER308L TIG Rod (1.6mm diameter) is a premium austenitic stainless steel filler metal designed for the Gas Tungsten Arc Welding (GTAW) process. This consumable is manufactured to meet strict AWS A5.9 specifications, ensuring a chemical composition that delivers superior mechanical properties and corrosion resistance. The 'L' designation indicates a maximum carbon content of 0.03%, a critical modification from standard 308 grades. This reduction in carbon significantly mitigates the risk of sensitization—the precipitation of chromium carbides at grain boundaries—which can occur in the heat-affected zone (HAZ) during welding. Consequently, this alloy maintains high resistance to intergranular corrosion without the need for post-weld solution annealing.

Metallurgically, the ER308L composition includes a balanced Chromium-Nickel ratio (nominally 20% Cr, 10% Ni) to provide a microstructure containing a controlled amount of ferrite. This ferrite number (FN) is optimized to prevent hot cracking during solidification while maintaining excellent cryogenic toughness and general corrosion resistance. This rod is the industry-standard choice for joining ASTM A240 Type 304 and 304L base metals, as well as stabilized grades like 321 and 347 in moderate temperature service.

The 1.6mm (1/16") diameter offers precise control for thin-to-medium gauge fabrication, allowing for lower heat input and reduced distortion. The rods are supplied in a 10lb protective tube, ensuring material cleanliness and straightness, which are paramount for manual or automated feeding in critical applications such as pressure vessels, piping systems, and architectural structures.

Industrial Applications

This filler metal is extensively used in industries requiring high sanitary standards and corrosion resistance. Common applications include the fabrication of dairy and food processing equipment, chemical storage tanks, pharmaceutical piping, and general structural stainless steel components. Its consistent chemistry ensures reliable performance in diverse environments.