Patent ID: 8196300

Claim:
A manufacturing method of an electric contact, comprising: superimposing a contact and a metal base on a jig, such that the contact and the metal base are supported by the jig, the metal base being disposed on the contact, the metal base having a first surface facing the contact and a second surface opposite to the first surface; pressing a rotational tool into the second surface of the metal base to come in contact with the second surface while the rotational tool rotates at a predetermined speed, wherein the rotational tool presses the second surface of the metal base in a region corresponding to the contact, and advances in a direction toward the jig, and generating frictional heat by friction between the rotational tool and the second surface in contact with the rotational tool wherein the generated frictional heat is then transferred to the first surface; joining together the contact and the first surface that is not in contact with the rotational tool, by solid state diffusion welding by using the transferred frictional heat; and then retracting the rotational tool from the metal base.