Oerlikon Curod 70/30 description: CUROD 70/30 is suitable for welding all copper-nickel alloys such as 70/30 - 80/20 - 90/10. Excellent corrosion resistance in saline solutions. The nickel addition strengthens the weld metal and improves the corrosion resistance, particularly against salt water. The weld metal has good hot and cold ductility.