Chemical components

Product Description

ECuNi is a high-performance copper-nickel coated electrode conforming to AWS A5.6/A5.6M standards, specifically formulated for welding wrought and cast 70/30, 80/20, and 90/10 copper-nickel alloys . Its all-position capability, combined with a nominal composition featuring approximately 30wt.% nickel, 0.5-2.5wt.% manganese, 0.4-2.5wt.% iron, and titanium for stabilization, with copper as the balance, delivers dense, porosity-free deposits with exceptional resistance to seawater corrosion and biofouling . This electrode is ideal for joining homogeneous copper-nickel alloys, dissimilar welding (copper-nickel alloys to steel, stainless steel, Monel 400, or Nickel 200), and for corrosion-resistant overlays and cladding applications using Shielded Metal Arc Welding (SMAW) .

Features

▪ Superior Corrosion Resistance in Marine Environments: Provides outstanding resistance to seawater corrosion, erosion, and cavitation, with excellent resistance to biofouling and stress corrosion cracking in chloride-containing environments . The optimized nickel content (typically 29.0-33.0wt.%) ensures robust performance in desalination plants, shipbuilding, and offshore applications where long-term exposure to salt water is critical .

▪ Stable and Reliable Mechanical Performance: The all-weld metal delivers good tensile strength (typically 350-425 MPa), yield strength (approximately 240-345 MPa), and excellent ductility with elongation of 20-38%, depending on specific product and welding conditions . The deposit maintains good toughness across a wide temperature range, including cryogenic service conditions, and exhibits good fatigue resistance in corrosive environments .

▪ Excellent Weldability and Handling: Features a stable arc with smooth, finely rippled bead appearance, easy slag removal, and excellent crack resistance . Designed for use with DC (+) polarity, it offers good operability in all positions including flat, horizontal, vertical-up, and overhead . Preheat is generally not required, but interpass temperature should be maintained below 100-150°C to prevent excessive heat buildup and ensure optimal corrosion resistance . Use short arc length and stringer bead technique for best results .

Applications

▪ Specifically developed for marine and corrosive environments requiring exceptional seawater resistance, ECuNi is essential in:
▪ Marine and Shipbuilding: Welding of seawater piping systems, ship hulls, propeller repair, condenser boxes, heat exchanger components, and marine hardware requiring corrosion resistance to salt water and anti-biofouling properties .

▪ Desalination and Chemical Processing: Construction and repair of desalination plants, evaporators, distillers, heat exchangers, and process equipment handling seawater, brackish water, and various chemical environments .

▪ Offshore and Power Generation: Fabrication of offshore platform components, seawater cooling systems, power plant condensers, and pollution control equipment requiring long-term durability in marine environments .

▪ Dissimilar Metal Joining: Ideal for welding copper-nickel alloys to steel (including clad steel), stainless steel, Monel 400, Nickel 200, and other copper alloys, as well as for overlay cladding on ferrous substrates for corrosion protection in marine service .

▪ General Fabrication and Repair: Repair of copper-nickel castings, food processing equipment, refrigerators, and industrial components requiring corrosion resistance and good mechanical properties .