EX320LR00001250TL0 - Exocor ER320LR Stainless TIG Welding Rod 3.2mm (1/8") - 10lb Tube

Technical Overview of Exocor ER320LR

The Exocor Executive ER320LR TIG Rod is a specialized austenitic stainless steel filler metal designed for the Gas Tungsten Arc Welding (GTAW) of Alloy 20 materials (UNS N08020). The 'LR' designation stands for 'Low Residuals,' indicating a strictly controlled chemical composition where elements such as Carbon, Silicon, Phosphorus, and Sulfur are kept to minimum levels. This modification is critical for this alloy class, as standard ER320 compositions can be susceptible to micro-fissuring and hot cracking due to the fully austenitic microstructure.

Metallurgically, this wire contains approximately 32-36% Nickel, 19-21% Chromium, 3-4% Copper, and 2-3% Molybdenum. It is also stabilized with Niobium (Columbium) to prevent carbide precipitation and subsequent intergranular corrosion. The high nickel and copper content provides exceptional resistance to stress-corrosion cracking and general corrosion in severe environments, particularly those involving hot sulfuric acid, phosphoric acid, and nitric acid. The 3.2mm (1/8") diameter allows for higher deposition rates on thicker base materials typically found in chemical processing tanks and piping systems.

Exocor's 'Executive' series ensures that the wire surface is manufactured to a high degree of cleanliness, reducing the introduction of oxides or contaminants into the weld pool. The rod is suitable for joining Alloy 20 to itself or to other dissimilar stainless steels where corrosion resistance must be maintained. It is typically welded using DCEN polarity with 100% Argon shielding gas.