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Joining Interface Mechanics Lab
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The lab investigates the phenomena that occur at the interfaces of joints and welds in metals and other materials.
AboutAbout the lab
Uncovering what happens at joining and welding interfaces
The lab studies phenomena at the interfaces formed when ferrous, non-ferrous and non-metallic materials, or combinations of them, are joined or welded.
It aims to clarify how interfaces form and to use that knowledge to create new interface control technologies.
Its research centers on friction joining methods such as friction stir welding (FSW), friction welding and linear friction welding, as well as fusion welding methods.
The lab belongs to the Joining Mechanism Division of the Joining and Welding Research Institute, Osaka University, and is also introduced as "Fujii Lab" on the lab's website.
According to the lab's website, joining the lab requires passing the graduate school entrance exam for the Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University.
Professor Hidetoshi Fujii also serves as director of the Nippon Steel Future Manufacturing Collaborative Research Institute and the Honda-Osaka University Joining Science and Manufacturing Collaborative Research Institute at the Joining and Welding Research Institute, and both institutes state that students take part in their research themes.
Key terms
- Friction stir welding
- A joining method in which a rapidly rotating tool is pressed against the materials. Also called FSW
- Linear friction welding
- A friction joining method performed without a tool. Severe deformation is applied to the interface being joined
- Solidification cracking
- Cracks that form while molten metal solidifies during welding
NewsLab news
Assistant Professor Takayuki Yamashita received the Osaka University Award (Young Faculty category)
A master's student received the Paper Encouragement Award of the JAAA2025 Symposium Awards
A master's student received the Excellent Poster Presentation Award from the Japan Light Metal Welding Association
Prof. Aoki and Prof. Yamashita received the Academic Commemorative Award and the Research Encouragement Award from the Iron and Steel Institute of Japan
Students received the Poster Presentation Award and the Excellent Presentation Award from the Japan Light Metal Welding Association
ResearchResearch themes
The lab aims to clarify how interfaces form by analyzing, both macroscopically and microscopically, the joint and weld interfaces of ferrous, non-ferrous and non-metallic materials and their combinations. Based on this knowledge, it works to establish new interface control technologies and to create next-generation joining and modification processes.
*Illustrative imageInterface control and formation mechanisms in friction joining
The lab works on friction stir welding of difficult-to-weld materials and on joining dissimilar material combinations such as Al and Mg. It has also developed a method that joins carbon steel below the A1 temperature (723°C), making joining possible regardless of carbon content.
*Illustrative imageDevelopment of new joining and modification processes
The lab has established methods that apply severe deformation to the joint interface through toolless linear friction welding and friction welding. It is also developing reverse friction stir welding, which joins hollow structures such as pipes from the inside.
*Illustrative imageHow weld interfaces and weld pools form
Using in situ observation with high-brightness X-rays at the large synchrotron radiation facility SPring-8, the lab has clarified microstructure formation and the formation process of solidification cracking in TIG welding. It also investigates the formation of the stir zone and defects during friction stir welding with a 3D visualization system.
*Illustrative imageAnalysis of joint interface structures
Using liquid CO2 and the stop-action method, the lab freezes the microstructure during friction stir welding, which allows it to separately examine microstructure formation during stirring and the annealing effect during cooling. For Mg alloys, it has also clarified how texture forms.
MembersFaculty
The members of the Joining Interface Mechanics Lab consist of faculty, project faculty, project researchers, researchers, administrative assistants, and doctoral, master's and undergraduate students.As of 2025
- ProfessorHidetoshi Fujii
- Project ProfessorKosaku Ushioda
- Project ProfessorEiichi Sato
- Project Associate ProfessorYoshiaki Morisada
- Project LecturerYoshihiro Aoki
- Assistant ProfessorTakayuki Yamashita
- Assistant ProfessorAbhishek Sharma
- Project ProfessorMuneaki Mukuda
- Associate ProfessorMasakazu Mori
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Friction Stir Weld” NASA / Public domain (cropped)
- Interface control and formation mechanisms in friction joining: “Reibrührschweißen (heute Rührreibschweißen) - Friction Stir Welding (FSW) - DLR (CC-BY 3.0)” DLR (CC-BY 3.0) / CC BY 3.0 (cropped)
- Development of new joining and modification processes: “Friction welding joint” Shanjeevi. C, Satish Kumar. S, Sathiya.P / CC BY-SA 4.0 (cropped)
- How weld interfaces and weld pools form: “Tig Welding WP9” Prowelder87 / CC BY-SA 4.0 (cropped)
- Analysis of joint interface structures: “Advanced friction stir welding and processing tools by MegaStir” NearEMPTiness / CC BY-SA 4.0 (cropped)
- Related lab (Welding Mechanism Lab): “Arc welding ( )” US Air Force from USA / Public domain (cropped)
- Related lab (Compositing Mechanisms Lab): “Composite 3d” PerOX / Public domain (cropped)
- Related lab (Daihen Welding and Joining Collaborative Research Lab): “FANUC 6-axis welding robots” Phasmatisnox / CC BY 3.0 (cropped)
- Related lab (Energy Control Lab): “Energy Arc (central electrode of a Plasma Lamp)” Blaise Frazier aka PiccoloNamek / CC BY-SA 3.0 (cropped)
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