Applications
Nimrod 190 deposits 65% Ni - 30% Cu weld metal based on Monel alloy 400 with raised levels of manganese and titanium to suppress hot cracking and porosity. It is optimised to give the highest as-welded ductility and strength attainable in weld metal of this type. For welding alloy 400 and similar parent material to itself and others in the Ni-Cu alloy system, such as pure nickel and cupronickel. Welds in alloy K500 are satisfactory but cannot match the strength of this precipitation-hardened alloy. Castings of alloy 400 with up to about 1.5%Si are welded with Nimrod 190, but higher silicon grades such as BS3071 NA2 and ASTM A743 M35-2 are virtually un-weldable because of HAZ cracking. For dissimilar joints between alloy 400 and other alloys or steels, sensitivity to dilution by Fe (20-30%) or Cr (3-6%) can lead to low ductility (or bend-test fissuring) in weld metal close to the fusion boundary.
Specification
AWS A5.14: ERNiCu-7
BS EN ISO 18274: SNi4060
BS2901: PT5 NA33
DIN 1736: (SG-NiCu30MnTi, 2.4377)