63061200 - Bonarc ER308L Stainless Steel TIG Rod .045" (5kg Tube)

Technical Specification: Bonarc ER308L TIG Filler Metal

The Bonarc ER308L is a premium quality solid TIG welding rod designed for the Gas Tungsten Arc Welding (GTAW) of austenitic stainless steels. This consumable is formulated to meet AWS A5.9 specifications, classifying it as an ER308L filler metal. The 'L' designation indicates a controlled low carbon content, typically restricted to a maximum of 0.03%. This modification is critical for metallurgical stability, as it significantly reduces the precipitation of chromium carbides at the grain boundaries during the welding thermal cycle. Consequently, the weld metal exhibits superior resistance to intergranular corrosion and sensitization, particularly in the heat-affected zone (HAZ).

Metallurgically, the rod deposits an 18% Chromium / 8% Nickel matrix with a controlled ferrite number (FN). The presence of a small percentage of ferrite in the austenitic structure is essential to prevent hot cracking (solidification cracking) during cooling. This makes Bonarc ER308L highly reliable for rigid structures and restrained joints where thermal stresses are high. The .045-inch (approx. 1.14mm) diameter offers precise control for low-amperage applications, allowing for minimal heat input and reduced distortion on thin-walled base metals.

This product is specifically engineered for joining base metals of similar composition, including AISI grades 301, 302, 304, 304L, 305, and 308. It is also suitable for welding 321 and 347 stabilized grades when service temperatures do not exceed 750°F (400°C). The rods are manufactured with a high-purity surface finish, free from drawing lubricants and oxides, ensuring a stable arc, excellent wetting characteristics, and X-ray quality welds. Packaged in a durable 5kg tube, the rods are protected from atmospheric contamination and physical damage during storage and transport.