This inventor holds 2 USPTO granted patents. Top assignees: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Toyota Jidosha Kabushiki Kaisha. Active years: 1993-1996.
Company Filing History:
2 out of 1,343 
1 out of 38,723 
Years Active: 1993-1996
Title: Yasuo Kotetsu: Innovator in Welding Technology
Introduction
Yasuo Kotetsu is a notable inventor based in Kariya, Japan. He has made significant contributions to the field of welding technology, holding 2 patents that showcase his innovative approaches to joining materials.
Latest Patents
One of his latest patents is a method and apparatus for welding. This invention involves a technique for joining a ball member to the end of a cylindrical matrix plunger body through resistance welding. The resulting plunger is designed for use in a directional control valve, which regulates fluid communication within the valve. The resistance welder utilized in this method features a pair of electrodes. The ball member is positioned in contact with a conical recess within the matrix plunger body and with a conforming surface of one of the electrodes. This setup creates a circular first contact between the ball member and the matrix plunger body, as well as a spherical second contact between the ball member and the electrode. The electrical contact resistance at the first contact is intentionally greater than that at the second contact. Consequently, an electric current flows at a constant rate for a controlled duration through both contacts, while the ball member remains under pressure against the matrix plunger body. The highest resistance and heating effect occur at the first contact, leading to the formation of a solid-phase joint.
Another significant patent by Kotetsu involves the method of forming a weld bead of pure copper on a ferroalloy base material. This process entails laying a powder of copper and melting it using a high-density energy source, such as laser beams, TIG arc, or electron beams. Prior to melting, the copper powder is mixed with an auxiliary metal powder that has a higher melting point than pure copper. To maintain the purity of the copper in the weld bead, the mixture must not contain more than 16 wt % nickel.
Career Highlights
Throughout his career, Yasuo Kotetsu has worked with prominent companies, including Kabushiki Kaisha Toyoda Jidoshokki Seisakusho and Toyota Jidosha Kabushiki Kaisha. His experience in these organizations has contributed to his expertise in welding technologies.
Collaborations
Kotetsu has collaborated with notable coworkers, including Minoru Kawasaki and Soya Takagi. Their collective efforts have further advanced the field of welding and material joining.
Conclusion