Resistance welding electrode

Claim 2

In a resistance welding electrode of copper or high melting alloy thereof having an outer work-contacting tip portion thereof defined by material plated thereon in direct contact with the copper outer work-contacting tip portion of said electrode, the improvement comprising, said material being selected from the group consisting of nickel, cobalt, iron, and high melting point alloys thereof.

Claim 3

The invention according to claim 1 in which said material has a melting point of at least 1,083* C.

Claim 4

The invention according to claim 1 in which said material has a coefficient of linear expansion of 16.4 + or - 5.0 X 10 6inch/inch/*C over the range 20*-100* C.

Claim 5

The invention according to claim 1 in which said material has an electrical conductivity of at least 15 percent IACS, a temperature coefficient of electrical resIstance of less than 0.01/*C and a thermal conductivity of at least 0.10 calories/cm/cm2/sec/*C.

Claim 6

The invention according to claim 1 in which said material is nickel.

Claim 7

The invention according to claim 1 in which said material is iron.

Claim 8

The invention according to claim 1 in which said material is plated onto said electrode to a thickness of about 0.0001-0.01 inch.

Claim 9

The invention according to claim 1 in which said material is cobalt.

Claim 10

In a method of resistance welding of material having a surface component of a metal of melting point lower than or equal to copper, the improvement which comprises using as an electrode a copper electrode having plated thereon on a work contacting tip portion of said electrode in direct contact with the copper of said electrode material selected from the group consisting of nickel, berylium, cobalt, iron, and high melting point alloys thereof.

Claim 11

In a method of resistance welding of material having a surface component of a metal of melting point lower than or equal to copper, the improvement which comprises using as an electrode a copper electrode having plated thereon on a work contacting tip portion of said electrode in direct contact with the copper of said electrode material selected from the group consisting of nickel, berylium, cobalt, iron, and high melting point alloys thereof.

Claim 12

In a method of resistance welding of material having a surface component of a metal of melting point lower than or equal to copper, the improvement which comprises using as an electrode a copper electrode having plated material thereon in direct contact with the copper of said electrode on the area of contact between the electrode and surface component, said plated material having a melting point of at least 1,083* C, a coefficient of linear expansion of 16.4 + or - 5.0 X 10 6 inch/inch/*C over the range 20*-100* C, an electrical conductivity of at least 15 percent IACS, a temperature coefficient of electrical resistance of less than 0.01/*C, and a thermal conductivity of at least 0.10 calories/cm/cm2/sec/*C.

Claim 13

In a method of resistance welding of material having a surface component of a metal of melting point lower than or equal to copper, the improvement which comprises using as an electrode a copper electrode having plated material thereon in direct contact with the copper of said electrode on the area of contact between the electrode and surface component, said plated material having a melting point of at least 1,083* C, a coefficient of linear expansion of 16.4 + or - 5.0 X 10 6 inch/inch/*C over the range 20*-100* C, an electrical conductivity of at least 15 percent IACS, a temperature coefficient of electrical resistance of less than 0.01/*C, and a thermal conductivity of at least 0.10 calories/cm/cm2/sec/*C.