Chemical components

Product Description

ERNiCu-7 is a premium nickel-copper solid welding wire compliant with AWS A5.14/A5.14M standards, designed for Monel 400 (UNS N04400), Monel 404 (UNS N05500), and Monel K-500 nickel-copper alloys. Featuring a balanced nickel-copper composition with Ni 62.0-69.0wt.%, Cu as balance, manganese ≤4.0wt.%, titanium 1.5-3.0wt.%, and strict impurity control (C≤0.15wt.%, S≤0.015wt.%), it excels in seawater and reducing acid environments. Compatible with GTAW (TIG), GMAW (MIG), and SAW processes, it supports welding of homogeneous nickel-copper alloys, dissimilar joints between Monel alloys and carbon/stainless steels, and corrosion-resistant surfacing with a buffer layer of ERNi-1.

Features

▪ Superior Corrosion Resistance: Offers exceptional resistance to seawater, brackish water, salt solutions, and reducing acids including sulfuric and hydrofluoric acid. The weld metal effectively resists chloride stress corrosion cracking and provides excellent performance in marine and chemical environments.
▪ Stable Performance: Titanium-stabilized design controls porosity and enhances weld metal integrity. The balanced nickel-copper composition with controlled manganese and iron content prevents hot cracking. Weld metal exhibits tensile strength of 76,000-78,000psi (524-538MPa), elongation ≥34%, and excellent ductility. The weld metal properties match Monel 400 base material characteristics without requiring post-weld heat treatment.
▪ Excellent Weldability: Ensures smooth weld formation with moderate molten metal fluidity and minimal spatter. Compatible with DCEN (GTAW) and DCEP (GMAW) modes, it adapts to various welding positions with maximum interpass temperature control (≤150℃). The wire provides stable arc characteristics across wide current ranges, with no preheat required for most applications.

Applications

▪ Ideal for marine and corrosive chemical environments, ERNiCu-7 is widely used in:
▪ Marine Industry: Seawater desalination equipment, ship pumps and valves, submarine pipelines, and offshore platforms. It serves in components exposed to saltwater and brackish water conditions.
▪ Chemical Industry: Sulfuric acid storage tanks, hydrofluoric acid reactors, chlor-alkali heat exchangers, and salt purification systems. It is used in equipment handling corrosive media and reducing acid environments.
▪ Power & Energy Sector: Nuclear power plant cooling systems, geothermal well casings, high-temperature steam valves, and oil refining components. It provides reliable performance in high-temperature and corrosive service conditions.
▪ General Industrial Applications: Overlay welding on carbon steel for corrosion protection, dissimilar metal joining between Monel alloys and carbon/stainless steels, and repair of nickel-copper alloy components. It serves as the preferred choice for critical equipment requiring seawater and acid corrosion resistance across global marine and chemical industries