03DOC60 - Harris ERCu Deoxidized Copper TIG Welding Rod 1/8" (3.2mm)

Technical Overview: Harris ERCu Deoxidized Copper TIG Rod

The Harris ERCu Deoxidized Copper TIG Rod is a premium filler metal engineered specifically for the Gas Tungsten Arc Welding (GTAW) of deoxidized copper. With a diameter of 3.2mm (1/8 inch), this rod is formulated to address the specific metallurgical challenges associated with welding copper, primarily the risk of porosity caused by oxygen and hydrogen absorption. The composition includes small, controlled amounts of phosphorus and silicon, which act as deoxidizing agents. These elements react with oxygen in the weld pool to form slag that floats to the surface, effectively preventing the formation of copper oxide inclusions and gas porosity within the solidified bead.

This filler metal typically meets AWS A5.7 Class ERCu standards. It boasts an electrical conductivity of approximately 98% IACS (International Annealed Copper Standard), making it an indispensable consumable for electrical industries where maintaining current flow across joints is critical. It is commonly utilized in the fabrication of copper bus bars, electrical conductors, and copper piping systems. The rod is also suitable for surfacing steel to provide corrosion resistance or for joining copper to mild steel, although specific procedures must be followed to minimize dilution.

When welding with Harris ERCu, the use of 100% Argon is standard for thinner sections, while Helium or an Argon/Helium mixture is recommended for thicker sections to increase heat input and counteract copper's high thermal conductivity. Preheating is often required for base metals exceeding 1/8 inch in thickness to ensure proper fusion and bead profile. The 10 lb tube packaging ensures a substantial supply for production environments while protecting the rods from environmental contaminants that could compromise weld quality.

Key Technical Specifications

• AWS Classification: ERCu


• Base Material Compatibility: Deoxidized Copper, Electrolytic Tough Pitch (ETP) Copper (with limitations)


• Melting Range: Approx. 1980°F (1083°C)


• Conductivity: High electrical and thermal conductivity