ELECTRODE FOR SPOT WELDING

WIPO Patent Application WO/2006/004073

A1

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 S₀ is 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.

KUROBE JUN (JP)
ASADA HIROSHI (JP)
MATSUBARA SHIGEO (JP)
TERAMOTO SHUICHI (JP)
MUKAE SHINGO (JP)
SAKAGUCHI SHIGEYA (JP)
MATSUO SHIGERU (JP)

PCT/JP2005/012281

January 12, 2006

June 28, 2005

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NISSHIN STEEL CO LTD (JP)
NIPPON TUNGSTEN (JP)
KUROBE JUN (JP)
ASADA HIROSHI (JP)
MATSUBARA SHIGEO (JP)
TERAMOTO SHUICHI (JP)
MUKAE SHINGO (JP)
SAKAGUCHI SHIGEYA (JP)
MATSUO SHIGERU (JP)

B23K103/04; B23K103/16; B23K11/30; (IPC1-7): B23K11/30; B23K103/04; B23K103/16

JPH0324388U	1991-03-13
JPS5449944A	1979-04-19
JPH01113182A	1989-05-01
JPH02117780A	1990-05-02
JPH05220581A	1993-08-31
JPH0439583U	1992-04-03

Ogura, Wataru (23-7 Kaname-cho 3-chom, Toshima-ku Tokyo, JP)

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