Abstract: An electrode assembly with a cooling passageway for improving electrode life expectancy and better weld quality. The electrode assembly includes an electrode body, and an electrode cap detachably coupled to the electrode body. A cooling passageway passes through the electrode assembly for carrying a cooling agent. The cooling agent enters the cooling passageway through an inlet port, removes the welding heat energy from the electrode assembly, and exits the cooling passageway through an outlet port. Further, an elastomeric seal, between a mating surface of the electrode body and the electrode cap, seals the electrode cap to the electrode body.