Cast iron is one of the most challenging materials to weld. Its high carbon content, brittle matrix, and sensitivity to thermal shock demand a filler metal that is soft, ductile, and forgiving. This is where ENiCu-B welding electrode has earned its place in maintenance shops and heavy industry worldwide.
ENiCu-B in the AWS Standard
ENiCu-B is classified under AWS A5.15, the standard for welding electrodes and rods for cast iron. Its weld deposit is a nickel-copper alloy (roughly 55 % Ni and 40 % Cu with controlled iron), engineered to remain ductile even when it dilutes with high-carbon cast iron.
Primary Applications
- Repair of broken engine blocks, cylinder heads, and pump housings
- Rebuilding damaged gearbox casings, machine bases, and heavy castings
- Dissimilar joints between cast iron and steel components
- Buttering layers on cast iron before final welding with other consumables
- Monel and nickel-copper alloy welding as a secondary application
Why Nickel-Copper Weld Metal Works on Cast Iron
The nickel matrix keeps carbon in solution rather than allowing it to form brittle carbides in the fusion zone. Copper adds ductility and helps match the color of gray iron, which is important for visible repairs. Together, they produce a weld that is machinable, crack-resistant, and mechanically compatible with cast iron.
Selecting a Reliable ENiCu-B Supplier
Look for suppliers that provide AWS A5.15 certification, mill test reports, and batch traceability. Dayang Welding supplies fully certified ENiCu-B electrodes to cast iron repair workshops, foundries, and OEMs across global markets.
