Toshifumi Kojima

Title: Innovations of Toshifumi Kojima

Introduction

Toshifumi Kojima is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of welding and metal bonding, holding a total of four patents. His work focuses on innovative methods that enhance the efficiency and effectiveness of metal joining processes.

Latest Patents

One of Kojima's latest patents is a method of liquid phase diffusion bonding of metal bodies. This invention involves an insert that comprises a thin substrate made by cold-rolling, along with two bonding alloy layers formed by plating on the upper and lower surfaces of the substrate. Both layers are extremely thin and consist of an alloy with a melting point lower than that of the substrate. This insert is crucial for achieving liquid phase diffusion bonding between first and second base metals. The insert is interposed between the two base metals, which are then clamped together under pressure and heated in a low-pressure atmosphere to facilitate the bonding process.

Another significant patent by Kojima addresses the prevention of magnetization of pipe blanks during GMA welding. This method involves using direct electric current supplied to multiple consumable electrodes in tandem. By connecting half of the electrodes to a positive polarity and the other half to a negative polarity, the lines of magnetic force produced by the direct current cancel each other out. This innovative approach prevents the magnetization of the pipe blank and the resulting magnetic arc blow during the welding process.

Career Highlights

Kojima is associated with Nippon Kokan Kabushiki Kaisha, a company known for its advancements in steel manufacturing and welding technologies. His work at this company has allowed him to develop and refine his innovative techniques in metal bonding and welding.

Collaborations

Throughout his career, Kojima has collaborated with notable colleagues, including Itaru Watanabe and Fusao Koshiga. These collaborations have contributed to the development of his patents and the advancement of welding technologies.

Conclusion

Toshifumi Kojima's contributions to the field of welding and metal bonding are significant and impactful. His innovative patents demonstrate a commitment to improving industrial processes and enhancing the quality of welded products. His work continues to influence the industry and inspire future innovations.