Patent ID: 8245396

Claim:
A method for crimping a terminal to an aluminum electric wire, comprising: preparing a terminal having an electric connecting portion which is configured to be connected with a mating terminal at a front end side thereof, and a conductor crimping portion which is configured to crimped to a conductor of an electric wire configured to be connected therewith by bent inward to be crimped at a rear end side thereof, wherein at least an inner surface of the conductor crimping portion is plated with a metal whose hardness is lower than a hardness of a metal of a terminal base material; preparing an aluminum electric wire having a conductor made of aluminum or an aluminum alloy as the electric wire configured to be connected with the conductor crimping portion; and crimping the conductor crimping portion to the conductor of the aluminum electric wire by bending the conductor crimping portion inwards in a state that the conductor of the aluminum electric wire is inserted into an interior of the conductor crimping portion of the crimp terminal, wherein a thickness of the metal applied to plate the inner surface of the conductor crimping portion is thicker than a thickness of the metal applied to plate an inner surface of the electric connecting portion, and wherein the thickness of the metal applied to plate the inner surface of the conductor crimping portion is set to be in a range from 2.1 μm to 5.0 μm.