ThePipingMart Blog Welding Electrodes AWS Class ERNiCu-7 Weld Wire – Composition, Properties, and Uses

AWS Class ERNiCu-7 Weld Wire – Composition, Properties, and Uses

AWS Class ERNiCu-7

AWS Class ERNiCu-7 is a nickel-based welding filler metal commonly used for welding and repairing nickel and copper-nickel alloys. It is known for its excellent resistance to corrosion and high-temperature applications. This blog will explore the composition, physical and mechanical properties, heat treatment, and corrosion-resistant properties of AWS Class ERNiCu-7. So, let’s dive in!

What is AWS Class ERNiCu-7?

AWS Class ERNiCu-7 is an electrode material used for shielded welding electrode applications. It can also be used in submerged arc welding applications to ensure excellent corrosion resistance and mechanical properties. This high-strength copper alloy features a post-weld heat treatment process that produces uniform microstructure, better toughness, and improved ductility. The combination of these characteristics results in the ability to join dissimilar metals with great efficiency while maintaining superior characteristics such as enhanced corrosion resistance and superior hardness at temperature ranges from cryogenic up to 500°F (260°C). With its high electrical conductivity, AWS Class ERNiCu-7 is widely used for joining aluminium, nickel alloys, steel, cast iron, copper alloys and titanium.

ERNiCu-7 Weld Wire Composition

AWS Class ERNiCu-7 is also known as Alloy 60, and its composition includes nickel, copper, manganese, iron, and silicon. It has a melting point of 1185°C (2165°F) and a density of 8.9 g/cm³. The nickel content in AWS Class ERNiCu-7 makes it highly resistant to corrosion, while the copper content improves its strength and thermal conductivity.

C Mn Fe P S Si Cu Ni Al Ti Other
0.15 4.0 2.5 0.02 0.015 1.25 Rem 62.0-69.0 1.25 1.5-3.00 0.50

ERNiCu-7 Weld Wire Physical Properties

AWS Class ERNiCu-7 welding filler wire has good thermal conductivity, making it suitable for high-temperature applications. It has a coefficient of thermal expansion of 13.8 x 10⁻⁶  / °C, similar to stainless steel. It also has good electrical conductivity, which can be used in electrical and electronic applications.

ERNiCu-7 Coated Wire Mechanical Properties

AWS Class ERNiCu-7 has excellent ductility, which measures a material’s ability to deform under stress and return to its original shape after stress is removed. The mechanical properties of AWS Class ERNiCu-7 vary depending on the welding process used, but it generally has a tensile strength of 70,000-85,000 psi and a yield strength of 45,000-60,000 psi.

AWS Class:    ERNiCu-7 Certification:                  AWS A5.14/A5.14M:2009
Alloy:  ERNiCu-7 ASME SFA A5.14

ERNiCu-7 Weld Wire Trade Name

Class UNS Oxford Alloys Special Metals UTP ESAB
ERNiCu-7 N10276 Alloy 60 MONEL FILLER METAL 60 UTP A 80 M OK AUTROD NICU-7

ERNiCu-7 Coated Wire Parameters

Diameter Process Volt Amps (flat) Amps (V/OH)
in (mm)
 .035 (0.9) GMAW 26-29 150-190 Spray Transfer 100% Argon
 .045  (1.2) GMAW  28-32 180-220  Spray Transfer 100% Argon
 1/16  (1.6) GMAW  29-33 200-250  Spray Transfer 100% Argon
 1/16  (1.6) GTAW  14-18 90-130  100% Argon
 3/32  (2.4) GTAW  15-20 120-175 100% Argon
 1/8  (3.2) GTAW  15-20 150-220  100% Argon

ERNiCu-7 Weld Wire Uses

AWS Class ERNiCu-7 coated electrode is commonly used for welding or repairing nickel and copper-nickel alloys. It is also used to manufacture heat exchangers and the chemical processing industry. Its excellent resistance to corrosion makes it suitable for marine applications as well.

ERNiCu-7 Coated Wire Heat treatment

AWS Class ERNiCu-7 is a non-heat treatable filler metal and does not require any post-weld heat treatment. However, it is important to clean the welded area to remove any impurities that may cause corrosion.

ERNiCu-7 Coated Wire Corrosion Resistant

One of the significant benefits of AWS Class ERNiCu-7 is its corrosion resistance. It is highly resistant to intergranular corrosion, pitting, and crevice corrosion in reducing or oxidizing conditions. This makes it an ideal choice for applications in marine and chemical industries where corrosion is a significant issue.

Conclusion

In conclusion, AWS Class ERNiCu-7 is a nickel-based welding alloy metal known for its excellent resistance to corrosion and high-temperature applications. Its composition includes nickel, copper, manganese, iron, and silicon, with a melting point of 1185°C (2165°F) and 8.9 g/cm³ density. AWS Class ERNiCu-7 has good thermal and electrical conductivity and flexibility, making it useful in various applications. It is commonly used for welding or repairing nickel and copper-nickel alloys, heat exchangers, and in the chemical processing industry. Its resistance to intergranular corrosion, pitting, and crevice corrosion makes it an ideal choice for applications where corrosion is an issue. AWS Class ERNiCu-7 is an excellent choice for high-temperature and corrosion-resistant applications.

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