Region of Research

This division is oriented (1) to providing scientific bases for generation-conversion-transportation and interaction with materials for Well-contro lled multifunctional energies indispensable to processing and constructing advanced materials, and (2) to development of high-quality energy sources suitable for various material processing.

In particular, our institute has made great contributions to the development of various advanced materials processing systems with concentrated and dispersed energy sources, which are expected to have wide application fields in the future. Major emphasis is placed on the developments of advanced monitoring and estimating techniques for material processing and the systematization of the functional materials prosessing technology through interpretation of phenomena relating to the high energy involved in the processing.

Welded or joined structures are widely used in a variety of industries, which support sustainable growth of our society. Expanding applications increase the demands for higher performance and reliability upon the welded and joined materials including dissimilar joints.
 In order to meet these demands, we investigate the mechanism involving the interface formation and joining on multi-scales from atomic and nanometer to meter in metallurgical and process-engineering points of view, through scientific understanding of the mechanical, physical and chemical properties of the various types of welded or joined materials such as bulk structures and multilayer thin films.
 Based on these investigations, a new scientific research field is created, and the design and development of the optimal materials, structures, and processes for welding and joining are performed in order to obtain a joint and composite having a high reliability and performance under interface control.

The promotion of the science and technology for manufacturing high-quality products and building durable structures leads to the innovative and sustainable growth of industries. The joining/welding design emphasizes the increasing need for a methodology to predict the structural performance and integrity from a stage of designing structures with the best use of materials. The Research Division of Materials Joining Assessment consists of three Departments; Joining Mechanics and Analyses, Joining Design and Structuring, and JJoining Metallurgical Evaluation, aiming at the creation of an interactive design system eligible for structural performance assessments in service conditions. Each Department deals with the simulation of joining & welding construction with computational technologies, ,development of design methods for strength and reliability of structures considering mechanical effects of welding and joining, and the reliability evaluation of welded joints in terms of materials science, respectively.

The Research Center for Additive Joining Application (RAJA) is established as a research organization in the Joining and Welding Research Institute (JWRI) on 1st April 2022 via the reorganization of the former Smart Processing Research Center. The primary objective of the RAJA is to investigate successive joining and welding phenomena in novel additive manufacturing (AM) processes. Practical applications of functional components of metals and ceramics with modulated structures should be actively and promptly realized in future industrial fields.
Five departments are included in the organization. Elementary processes of novel AM will be optimized and systematized through the successful synthesis and assemblies of high-performance nanomaterials. For the effective modulation of joining and welding energy sources, interface phenomena should be computationally simulated and visualized via machine learning in artificial intelligence. To encourage joint usage and research in the JWRI, interdisciplinary collaborations should be promoted to propose future endeavors.
In terms of collaborative activities, diversity and inclusion must be considered at all times. Through a cooperative endeavor with the JWRI, AM components fabricated by the RAJA will be joined and welded after spatial constructions using robots and drones. As the educational counterpart of the graduate school of engineering, competent personnel with global perspectives should be continuously shaped to achieve sustainable development goals. Through industrial-academia collaboration for social implementation, decarbonized societies should be realized, and hydrogen resources should be utilized.




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