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.

Products of the line CuNi 70-30

Product name Process AWS specifications EN ISO specifications
DAIKOWM 413 GMAW
AWS A5.7
ERCuNi
EN ISO 24373
S Cu 7158 / CuNi30Mn1FeTi
DAIKOWT 413 GTAW
AWS A5.7
ERCuNi
EN ISO 24373
S Cu 7158 / CuNi30Mn1FeTi
DAIKO 187 SMAW
AWS A5.6
ECuNi
-
G-TECH 413 SMAW
AWS A5.6
ECuNi
-
DAIKOSTRIP 413 ESW SAW
AWS A5.7
EQCuNi
-

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