CuAlNi

This subfamily is aimed at the deposition of bronze with aluminum and nickel, particularly suitable for the welding of base materials, both wrought and cast, with a similar composition. Alloys of this type offer high resistance to stress corrosion, erosion caused by cavitation, fatigue due to corrosion, and attacks from acids and chlorides. These properties make them ideal for applications such as pumps that need to withstand corrosion and sparking, navigation propellers, and heat exchangers used in offshore, maritime, and mining environments. Regarding aluminum bronze alloys, no preheating is required, and the maximum interpass temperature should be limited to 150 °C. It should be noted that the resistance to hot cracking, in thick sections and under high constraints, is lower compared to unalloyed aluminum bronze. A valid alternative consists in filling with aluminum bronze and CuAl for increased ductility, with a final finish in CuAlNi.

Cu-9%Al-5%Ni bronze for welding similar nickel aluminum bronze alloys.

In the as-welded condition consists of a duplex α + β microstructure.

Joining aluminum bronze. Weld overlay on steels.

• EN W.Nr.: 2.0966 (CuAl10Ni5Fe4), 2.0970 (CuAl10Ni3Fe2-C), 2.0978 (CuAl11Ni6Fe5), 2.0980 (CuAl11Fe6Ni6-C)
• ASTM: C63200, C63000 (CA630), C95800 (cast), C95500 (cast), C95520 (cast)