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US 4,904,839 AGranted
Electrodes for use in spot welding
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsRyo Tan, Eiichi Shigekura, Shigeo Kidachi
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsRyo Tan, Eiichi Shigekura, Shigeo Kidachi
Estimating the term…
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.
An electrode for use in spot welding, in which a cup-shaped cap made of metallic material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to those of members to be welded, is fitted around a tip end of an electrode main body;
An electrode for use in spot welding, in which a cup-shaped cap made of metallic material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to those of members to be welded, is fitted around a tip end of an electrode main body;
An electrode for use in spot welding, in which a cup-shaped cap made of metallic material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to those of members to be welded, is fitted around a tip end of an electrode main body;
An electrode for use in spot welding, in which a cup-shaped cap made of metallic material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to those of members to be welded, is fitted around a tip end of an electrode main body;
An electrode for use in spot welding, in which a cup-shaped cap made of metallic material having a small electric conductivity, a small thermal conductivity and a high melting point temperature as compared to those of members to be welded, is fitted around a tip end of an electrode main body;
Dependencies are inferred from the claim text.