COPPER-NICKEL FILLER METAL · MARINE SOURCING
ERCuNi Copper-Nickel Welding Consumables
Technical sourcing of ERCuNi copper-nickel solid wire and rods by classification, process, diameter, package and documentation requirements.
MNK-G.S.A coordinates copper-nickel welding consumables for shipboard, seawater-system, repair and industrial fabrication inquiries, subject to the approved welding procedure and project specification. Sources and verification scope
Classification Identity
- AWS A5.7/A5.7M:2026 is the current AWS reference for bare copper and copper-alloy welding rods and electrodes. The manufacturer catalogue does not state a standard edition for its classification entry.
- voestalpine Böhler Welding lists UTP A 387 solid wire as AWS ER CuNi and ISO S Cu 7158 (CuNi30Mn1FeTi). This is a named-product mapping, not universal interchangeability.
- ISO 24373:2018 remains published; ISO records its confirmation in 2023.
- Confirm the offered product, process, diameter, batch documents and project approvals separately.
Standards and Supply Definition
| AWS classification | ER CuNi in the UTP A 387 catalogue entry; AWS A5.7/A5.7M:2026 is the current reference edition, not an automatically certified batch edition |
|---|---|
| ISO classification | S Cu 7158 (CuNi30Mn1FeTi), as listed for UTP A 387; ISO 24373:2018 is the current reference |
| Verified product form | UTP A 387 solid wire in the manufacturer catalogue; TIG rods require their own manufacturer documentation |
| Dimensions and packaging | Specify diameter, rod length or spool format, package mass and quantity; availability must be confirmed for the offered product |
| Marine application | Copper-nickel piping, plate, repair or overlay only after base-metal and approved WPS review |
| Ordering requirements | Classification, process, manufacturer, batch traceability, required approvals, certificate and delivery destination |
Application Context
Nickel Institute guidance describes 70/30 copper-nickel consumables for joining both 90/10 and 70/30 copper-nickel alloys. Joining to steel requires separate filler selection because iron dilution changes cracking behaviour. This is background guidance, not an approved welding procedure; confirm the joint design, cleaning, shielding, service conditions and WPS/PQR.
RFQ and Quality Controls
- Exact copper-nickel base-alloy designation and product form
- Joint type, thickness, welding process and WPS/PQR
- Wire or rod diameter, package and manufacturing source
- Cleaning, shielding and project/class requirements
- Batch certificate, traceability, quantity and destination
Related Technical Pages
Technical Sources and Scope
Reference editions checked on 27 September 2026: AWS A5.7/A5.7M:2026 and ISO 24373:2018. ISO lists confirmation in 2023. The links identify the standards; they do not reproduce their protected requirements.
Manufacturer evidence: the voestalpine Böhler Welding catalogue entry for UTP A 387 identifies the solid-wire form and the AWS/ISO designations quoted here. Diameter, packaging, certification edition and availability require product-specific confirmation.
Nickel Institute provides application context only. The approved WPS, classification-society requirements and customer specification govern the actual selection.
Relevant ISO Reference
Use the current authorised ISO publication together with the governing specification, manufacturer documentation and project requirements. A reference link alone does not establish grade equivalence, product compliance or application approval.
Send Your Technical Inquiry
Send the base material, filler classification, welding process, approved WPS or project standard, diameter, package, quantity, documentation requirements and delivery destination.