63091200 - Bonarc ER309L Stainless Steel TIG Rod 0.045" (5kg Tube)

Premium Bonarc ER309L TIG Welding Rods for Industrial Fabrication

The Bonarc ER309L TIG Rod is a high-performance austenitic stainless steel filler metal designed to meet the rigorous demands of modern industrial welding. With a diameter of 0.045 inches and packaged in a convenient 5kg tube, this consumable is an essential inventory item for fabrication shops, maintenance departments, and petrochemical facilities. The ER309L classification indicates a composition similar to the standard 309 grade but with a restricted low carbon content (maximum 0.03%). This modification is critical for preventing intergranular carbide precipitation during the welding process, thereby maintaining the corrosion resistance of the weld zone without the need for post-weld heat treatment.

One of the primary industrial applications for the Bonarc ER309L is the joining of dissimilar steels. It is the industry-standard choice for welding austenitic stainless steels (such as 304 or 316) to carbon or low-alloy steels. The alloy's chemistry is balanced to provide a ductile, crack-resistant weld deposit even when diluted by the base metal. This makes it indispensable for structural repairs, equipment modification, and the fabrication of transition joints in piping systems. Additionally, it serves as an excellent buffer layer when cladding carbon steel with stainless steel, providing a stable foundation for subsequent layers of 308L or 316L.

Bonarc is known for consistent manufacturing quality, ensuring that these TIG rods deliver smooth feeding, stable arc characteristics, and excellent bead aesthetics. The rods exhibit high-temperature oxidation resistance, making them suitable for applications where components are exposed to heat. Whether used for welding AISI 309 base metals or for general-purpose dissimilar joining, these rods provide the reliability professional welders expect. The 5kg protective tube packaging ensures that the rods remain straight, clean, and free from contaminants until they are ready for use.

Key Industrial Benefits

• Dissimilar Metal Joining: The go-to solution for welding stainless steel to mild steel with reduced cracking risk.


• Corrosion Resistance: Low carbon content protects against intergranular corrosion in the heat-affected zone.


• Versatility: Suitable for buffer layers, cladding, and welding heat-resistant castings.


• Quality Assurance: Manufactured to meet AWS specifications for consistent performance.