Chemical components

Product Description

ECuSn-C is a premium tin-phosphor bronze coated electrode conforming to AWS A5.6/A5.6M standards, specifically formulated for welding phosphor bronze, brass, gun metal, and similar copper-tin alloys . Its all-position capability, combined with a nominal composition featuring high tin (approximately 7.0-9.0wt.%) and controlled phosphorus (≤0.30wt.%) in a copper matrix, delivers dense, porosity-free deposits with excellent wear resistance and bearing properties . This electrode is ideal for joining homogeneous copper-tin alloys, dissimilar welding (bronze to steel or cast iron), and for surfacing and cladding applications requiring low friction coefficients using Shielded Metal Arc Welding (SMAW) .

Features

▪ Superior Wear and Bearing Properties: Provides exceptional resistance to metal-to-metal wear, galling, and friction, making it ideal for bearing surfaces and moving parts. The high tin content (typically 7.0-9.0wt.%) forms a hard, wear-resistant microstructure with excellent anti-friction characteristics for applications requiring low coefficients of friction .
▪ Stable and Reliable Mechanical Performance: The phosphor-bronze composition produces sound, porosity-free deposits with good strength and ductility. The all-weld metal delivers tensile strength of approximately 270-390 MPa, excellent elongation (≥20-30%), and hardness ranging from 90-100 HB, ▪ providing good impact resistance and durability for components subject to shock and vibration .
▪ Excellent Corrosion Resistance: Offers good resistance to seawater, atmospheric corrosion, and various chemical environments, making it suitable for marine and industrial applications. The tin-rich matrix provides resistance to dealuminification and selective phase attack common in other copper  alloys Good Weldability and Handling: Features a stable arc with smooth, finely rippled bead appearance and easy slag removal. Designed for use with DC (+) polarity, it offers excellent operability in all positions including flat, horizontal, vertical-up, and overhead . Due to copper's high thermal  conductivity, preheating (typically 150-300°C depending on base material) is recommended for sections over 5mm to ensure proper fusion and prevent lack-of-fusion defects . The bead width should be kept within 3x the rod diameter, and hot peening between passes is recommended to refine grain structure and improve mechanical properties .

Applications

▪ Specifically developed for bearing surfaces, wear-resistant overlays, and general fabrication of copper-tin alloys, ECuSn-C is essential in:
▪ Marine and Shipbuilding: Repair and fabrication of ship propellers, impeller blades, seawater piping systems, and marine hardware requiring corrosion resistance and anti-galling properties .
▪ Industrial Machinery: Welding and surfacing of gear wheels, bearings, pump components, valve bodies, turbine blades, and sliding guides subject to metal-to-metal wear and friction .
▪ Electrical Industry: Repair of electrode holders, switchgear components, and conductor rolls requiring good electrical conductivity and wear resistance .
▪ Foundry and Casting Repair: Filling defects in new bronze castings, repairing phosphor bronze bushings, and reconditioning worn cast iron or copper alloy components .
▪ Dissimilar Metal Joining: Suitable for welding copper alloys to steel, cast iron, and other ferrous materials where moderate strength and corrosion protection are required .
▪ General Maintenance: Repair of cracked engine water jackets, cylinder heads, and various industrial equipment requiring bronze welding characteristics .