Patent ID: 7111376

Claim:
A method of making a tool, said method comprising: providing a pair of blade members and a tool body, each blade member being constructed of one or more metallic materials and having a backing portion and a cutting edge portion, the tool body comprising first and second elongated members, each elongated member constructed of a metallic material and having a handle portion at one end and a jaw portion at an opposite end, each jaw portion having one or more welding projections, intermediate portions of the elongated members being coupled to one another for movement about a pivot axis such that movement of the handle portions from an open position to a closed position moves the jaw portions from an open position in which the jaw portions are relatively far apart from one another to a closed position in which the jaw portions are relatively close to one another and movement of the handle portions toward their open position moves the jaw portions away from one another; and welding each of the blade members to the associated jaw portion of the associated elongated member by (a) placing each blade member in contact with the projection on the respective jaw portion and (b) applying electrical current and force to the tool body and the blade members, the applied electrical current flowing through each projection and the associated blade member and establishing a sufficient current density in each projection to heat each projection sufficiently to cause the metallic material of each projection to soften, the force moving each blade member and softened metallic material from each projection toward the associated jaw portion thereby forming a welded connection between each blade member and a respective jaw portion of the tool body, wherein the backing portion of each of the blade members contains a relatively lower amount of carbon in comparison with the amount of carbon in the cutting edge portion of the blade members.