A wire cable configured to be attached to a wire cable terminal. An uninsulated end of the wire cable is formed into a nugget having a shape that generally defines a rectangular cuboid or rectangular prism. The nugget includes one face that defines a longitudinal concavity, indentation, or channel, which is oriented generally parallel to the longitudinal axis of the wire cable. The nugget may be formed by ultrasonically welding the wire strands together. The concavity reduces the occurrence of fracturing the nugget when it is attached to the terminal by wire crimping wings. The wire cable may be formed of aluminum-based material. An apparatus for forming an end of a wire cable into a nugget shape having a longitudinal concavity and a method of attaching a wire cable having an end formed into a nugget shape having a longitudinal concavity to a terminal is also presented.