The OK Tigrod 19.49 is a bare Cu-Ni rod for welding similar alloys, such as 90Cu10Ni, 80Cu20Ni and 70Cu30Ni. The addition of nickel in this rod plays a crucial role in strengthening the weld metal and improving its corrosion resistance, particularly in salt water. This alloy is commonly used for overlay welding of steels and is a popular choice for welding Cu-Ni components in desalination plants.