ELECTRODE FOR SPOT WELDING

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An electrode for spot welding which has a double structure where a core material (3) made of W or Mo is imbedded in a an electrode body (2) wherein the area (S1) of the core material (3) is set to be (0.7 to 3.0) × S0 where S0is the area of a contacting face (2a) contacting with a material to be welded. Optionally, fine particles are dispersed in the core material (3) made of W or Mo in an amount of 0.5 to 10 volume %. The fine particle comprises an oxide, a nitride, a carbide, a boride or the like of a 2A Group element, a 4A Group element, a 5A Group element, a 6A Group element or a rare earth element. The above electrode for spot welding has the core material made of W or Mo imbedded in the body, which results in the inhibition of the welding or alloying with a plating metal even in the case of the spot welding of a steel plate plated with a zinc-based metal under a high electric current. Consequently, the above electrode can be used as an electrode for spot welding being suitable to the welding of a material being difficult to weld, such as a plated steel plate and an aluminum material, and having a long life.