ERNiCu-7/UNS N04400/W.Nr.2.4377 AWS A5.14 Wire

Overview

ERNiCu-7 is used for MIG, TIG, and SAW welding of copper alloys. It is used for joining base materials such as UNS number NO4400, NO4405 and NO5500. This alloy can be used for dissimilar welding applications using various nickel-copper alloys to nickel 200 and to copper-nickel alloys. This alloy can be used to overlay over carbon steel, provided a buffer layer of ERNi-1 is used for the first layer.

Limiting Chemical Composition, %

Nickel..................................................................................................................................................................................62.00-69.00

Titanium..................................................................................................................................................................................1.50-3.00

Manganese.............................................................................................................................................................................4.00 max.

Iron..........................................................................................................................................................................................2.50 max.

Copper.................................................................................................................................................................................18.81-36.50

Silicon.....................................................................................................................................................................................1.25 max.

Aluminium..............................................................................................................................................................................1.25 max.

Carbon....................................................................................................................................................................................0.15 max.

Phosphorous..........................................................................................................................................................................0.02 max.

Sulfur.....................................................................................................................................................................................0.015 max.

Mechanical Properties

Corrosion Resistance

ERNiCu-7 exhibits outstanding corrosion resistance, making it well-suited for applications in corrosive environments commonly found in the petrochemical and marine industries. The alloy’s corrosion resistance is attributed to the presence of nickel, which forms a protective oxide layer on the surface of the material, preventing corrosive elements from reaching the underlying substrate.

The addition of chromium further enhances the corrosion resistance of ERNiCu-7. Chromium forms stable oxides that act as a barrier, preventing the penetration of corrosive agents. This dual-layer protection, facilitated by nickel and chromium, ensures long-term durability and reliability in challenging environments where corrosion is a significant concern.

High-Temperature Performance

One of the standout features of ERNiCu-7 is its exceptional stability at high temperatures. This property makes it an ideal choice for applications where exposure to elevated temperatures is a constant factor, such as in the aerospace and power generation industries.

The alloy’s high-temperature stability is attributed to the synergistic effects of its alloying elements. Nickel, the primary component, contributes to the overall heat resistance of the alloy. Chromium enhances oxidation resistance, preventing the formation of detrimental oxides that could compromise the material’s integrity. This combination of elements results in a welding wire that can withstand the challenges posed by extreme temperatures, ensuring structural integrity and reliability in demanding environments.