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Is post weld heat treatment required when welding copper-nickel alloys?

Post weld heat treatment is normally unnecessary.

Copper-nickel Alloys, Properties and Applications - Pub 030

Copper nickel properties and applications are provided in this technical publication. Composition and properties of the 90/10 and 70/30 copper-nickel alloys are given, together with examples of their applications. 1982. 40pp. Archive for reseach purposes.

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Copper-nickel 90/10 and 70/30 Alloys, Technical Data - Pub 031

Copper nickel technical data for 90/10 and 70/30 alloys including compositions, physical, mechanical and fabrication properties for these two most commonly encountered copper-nickel alloys. 1982. 32pp. Archive for reseach purposes.

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Copper-nickel Cladding for Offshore Structures- Pub 037

The cost savings available when copper-nickel cladding is used to prevent corrosion and marine organism attachment are significant. This publication details how they can be achieved. 1986. 16pp. Archive for research purposes.

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Materials for Seawater Pipeline Systems - Pub 038

Gives reasons for choice of 90/10 copper-nickel alloy in preference to other materials for many applications. 1986. 16pp. Archive for research purposes.

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Pub 098 - Joining of Copper and Copper Alloys

Suitability of the many methods now available for the jointing of copper and copper alloys with details of filler materials and recommendations for good joining practice. 1994. 64pp.

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Pub 106 - Corrosion Resistance of Copper and Copper Alloys

This large table gives information on the suitability of copper and copper alloys with many different chemicals. Data is given for copper, brass, copper-nickel, aluminium bronze and gunmetals at three temperatures and shows if specific materials can be used with chemicals giving an indication of corrosion resistance. 5pp.

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Are 90-10 and 70-30 copper-nickels susceptible to stress corrosion cracking?

They do not experience chloride or sulphide stress corrosion. They have a high resistance to ammonia stress corrosion compared to other copper alloys and do not require a stress relief anneal for seawater service.

Are 90-10 welding consumables available for welding 90-10 copper-nickel?

They are available but 70-30 copper-nickel consumables are preferred for welding both the 90-10 and 70-30 alloys due to superior deposition characteristics.

Are copper-nickel alloys susceptible to the attachment of marine organisms in seawater?

Copper-nickel alloys can harbour slimes, but the attachment of macro-organisms—such as marine grasses and shellfish—is impaired. If these do become attached under quiet conditions, adherence is poor and they can be easily removed mechanically.

Copper-nickel Welding and Fabrication - Pub 139

This publication provides an understanding of the two primary copper-nickel alloys to allow good fabrication and operational practices to optimise in-service performance. Topics covered include general engineering properties of 90/10 and 70/30 copper-nickels, welding and fabrication practices and a basic overview of corrosion and performance in seawater immersion trials. 2018. 32pp.

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Copper Alloys in Marine Environments - Pub 206

The aim of this publication is to provide engineers with an  appreciation of copper alloys commonly used in marine applications. It will provide an overview of the range of alloys and their properties, and give references and sources for further information. 2018. 32pp.

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