DAIKOWM 413

GMAW
  • COPPER ALLOYS
CuNi 70-30

Description

70/30 copper-nickel solid wire
The weld metal of this wire rod is designed to match the CuNi 70/30 alloys and is nominally 67% Cu and 30% Ni. The consumable is suitable for surfacing and cladding provided buffer layer is made (normally buttering is made with alloy 400 or pure nickel). Applications include offshore construction, desalination plant, evaporators, condenser, etc, in salt and sea water processing system.
Specifications
EN ISO 24373
S Cu 7158 / CuNi30Mn1FeTi
AWS A5.7
ERCuNi
DIN 1733
SG-CuNi30Fe
Shielding
I1, I3
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
Drums, B300, D200 and D100 spools.
Asme qualifications
F-No (QW432)
34
A-No (QW442)
-

Hardness

80HV - 110HV
Chem. Comp. %
DEFAULT
Mn
0.8
Ni
31
P
0.003
S
0.005
Si
0.01
Fe
0.5
Ti
0.3
Pb
0.001
Mechanical Properties
min
variant
Tensile strength Rm MPa
345
400
Yield strength Rp0.2 MPa
-
200
Elongation A (L0=5d0) %
0
38
Impact Charpy ISO-V
-
200J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.0 mm
1.2 mm
Ampere
130A - 200A
185A - 245A
Voltage
24V - 28V
26V - 30V
Packaging
Ø 0,8÷1,6mm
Ø 0,8÷1,6mm
Packaging Type
Drums, B300, D200 and D100 spools.
Drums, B300, D200 and D100 spools.
Description

Application

The CuNi 70-30 consumable is particularly suitable for overlay and cladding operations, provided a buttering layer is created. This is commonly done using alloy 400 or pure nickel. The 70/30 consumables are ideal for welding 70/30, 80/20, and 90/10 base materials. They match the 70/30 base materials in terms of strength and color, and allow for overmatched welding on 90/10 alloys for optimal strength. This material is widely used in offshore constructions, desalination plants, evaporators, condensers, and systems for treating saline and marine water. No preheat is required, and the maximum interpass temperature is 150°C, with no need for PWHT. It is crucial to avoid contamination in the weld area with foreign materials, particularly sources of lead, tin, or zinc, to prevent cracking in the weld metal.

Alloy Type

70/30 copper-nickel alloys.

Microstructure

Solid solution, single phase alloy.

Materials

  • EN W.Nr.: 2.0872 (CuNi10Fe), 2.0882 (CuNi30Mn1Fe), 2.0883 (CuNi30Fe2Mn2)
  • ASTM: C71500, C96400 (cast)
  • UNS: C71500, C96400, C70600, C96200
  • PROPRIETARY: Cunifer 30 (VDM), Cunifer 10 (VDM), Osna®-30 (KME), Osna®-10 (KME)

Welding & PWHT

Particularly suitable for welding applications that require high resistance to corrosion in aggressive environments. This includes systems exposed to saline and seawater, where long-term durability is critical.

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