AWS: ECuNi WELDING ELECTRODES

Product data sheet / Overview:

The ECuNi electrode is designed for welding copper-nickel alloys, particularly those containing approximately 70% copper and 30% nickel, commonly referred to as 70/30 CuNi. This electrode is widely used in marine and desalination applications due to its excellent resistance to seawater corrosion and biofouling. It is also suitable for joining copper-nickel to steel and for overlaying on steel. It provides excellent resistance to oxidation and high-temperature corrosion, making it suitable for use in harsh environments such as chemical processing plants, power generation facilities, and aerospace applications.

Specifications : (Monel Alloys 187)

• Classification: AWS A5.6 ECuNi
• Type: Covered Electrode
• Diameter Range:2.5mm, 3.2mm, 4.0mm

Chemical Composition (%)

Element	Composition (%)
Copper (Cu)	62.0 - 69.0
Nickel (Ni)	29.0 - 33.0
Iron (Fe)	0.4 - 1.0
Manganese (Mn)	0.5 - 1.0
Silicon (Si)	≤ 0.5
Carbon (C)	≤ 0.05
Sulfur (S)	≤ 0.02

Mechanical Properties

Property	Value
Tensile Strength	340 MPa (min)
Yield Strength	130 MPa (min)
Elongation	30% (min)
Hardness	Approx. 70-90 HB

Applications

• Marine Industry: Construction and repair of ships, offshore structures, and seawater desalination plants.
• Desalination Plants: Components exposed to saline environments, such as evaporators and heat exchangers.
• Heat Exchangers and Condensers: Especially in power plants and chemical processing plants.
• Piping Systems: For the transportation of seawater and other corrosive fluids.

Storage and Handling

• Storage: Store in a dry, cool place to prevent moisture absorption. Ensure electrodes are kept in their original packaging until use.
• Handling: Handle with care to avoid damage to the electrode coating. Avoid exposure to water and oil.

Safety Precautions

• Personal Protective Equipment (PPE): Use appropriate PPE including welding helmets, gloves, aprons, and safety glasses.
• Ventilation: Ensure adequate ventilation or use fume extraction systems to avoid inhaling welding fumes.

Manufacturers

• ESAB
• Special Metals
• Lincoln
• Bohler/UTP
• Daiko
• Selectarc

Product Name

Brand	Product Name
Special Metals	MONEL Welding Electrode 187 (90/10, 70/30)
BOHLER /UTP	UTP 387
ESAB	OK 94.35
Daiko	Daiko 187
Lincoln	Tech-rod® 187
Selectarc	SELECTARC CuNi30

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