Electric heating – Metal heating – For bonding with pressure
Patent
1988-12-22
1990-02-27
Miller, Jr., George H.
Electric heating
Metal heating
For bonding with pressure
B23K 1130, B23K 3500
Patent
active
049048392
ABSTRACT:
Electrodes for use in spot welding which can spot-weld a metallic material having a large electric conductivity and a large thermal conductivity with a small electric current. A cup-shaped cap made of material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to the material to be welded, for instance, made of titanium, is fitted arond a tip end portion of an electrode main body. The top surface of the cap is formed in a spherical shape having a large radius of curvature, and a depression is formed at the central portion of the top surface. The thickness of the top wall is thick at the central portion and thin at the peripheral portion. Plating of soft metal having a better thermal conductivity than the electrode main body is applied onto the entire inner surface of the cap coming into contact with the electrode main body. At least between the top wall of the cap and the tip end surface of the electrode main body, is interposed a plate member made of metal having a better electric conductivity than the electrode main body and a good thermal conductivity and a small hardness as compared to the cap. At least the top surface of the cap is subjected to nitriding treatment.
REFERENCES:
patent: 1176614 (1916-03-01), Stanley
patent: 2701834 (1955-02-01), Moore
patent: 3363086 (1968-01-01), Ecklund et al.
patent: 3665145 (1972-05-01), Engel
patent: 4288024 (1981-09-01), Nippert
patent: 4843206 (1989-06-01), Azuma et al.
Kidachi Shigeo
Shigekura Eiichi
Tan Ryo
Honda Giken Kogyo Kabushiki Kaisha
Miller Jr. George H.
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