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Joining Interface Mechanisms Lab [Joining and Welding Research Institute]
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A lab that investigates the mechanisms behind the interfaces formed in joining and welding of materials.
AboutAbout the lab
Uncovering how joining interfaces form.
The Joining Interface Mechanisms Lab (the Fujii Lab) analyzes phenomena that occur at the interfaces of joining and welding, which connect materials, and studies how those interfaces form.
Its aim is to establish new interface control technologies based on this knowledge.
Focusing mainly on friction joining methods such as friction stir welding and on fusion welding methods, the lab aims to create next-generation joining and modification process technologies.
Assignment to the lab is stated to require passing the entrance examination of the Department of Materials and Manufacturing Science, Graduate School of Engineering.
Professor Hidetoshi Fujii is also director of both the Nippon Steel Monozukuri Future Collaborative Research Institute and the Honda-Osaka University Joining Science Monozukuri Collaborative Research Institute at the Joining and Welding Research Institute, and states that students take part in the research themes at both.
Key terms
- Friction stir welding
- A joining method in which a tool rotating at high speed is pressed against the surface of a structure.
- Linear friction welding
- A method that joins without a tool by applying intense deformation to the joining interface.
- Solidification cracking
- Cracking that occurs as molten metal solidifies.
NewsLab news
An Assistant Professor received the Osaka University Award, Young Faculty category
A master's student received the Paper Encouragement Award at the JAAA2025 Symposium Awards
A master's student received the Excellent Poster Presentation Award from the Japan Light Metal Welding Association
At the Iron and Steel Institute of Japan, a Project Lecturer received the Academic Memorial Award (Shiraishi Memorial Award) and an Assistant Professor received the Research Encouragement Award
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 what phenomena occur at the interfaces of joining and welding and how those interfaces take shape, and to lead to new interface control technologies. Centering on friction joining methods and fusion welding methods, it works on everything from developing joining processes to analyzing interface structures.
*Illustrative imageInterface Control and Formation Mechanisms in Friction Joining
The lab works on friction stir welding of difficult-to-join materials such as high-strength steel and titanium alloys, and of dissimilar material combinations such as aluminum and magnesium. It is also developing joining methods that are combined with lasers.
*Illustrative imageDevelopment of New Joining and Modification Processes
The lab is establishing methods that apply intense deformation to the joining interface, using tool-free linear friction welding and friction welding. It is also developing reverse friction stir welding technology, which can join hollow structures such as pipes from the inside.
*Illustrative imageHow Weld Interfaces and Molten Pools Form
Using high-brightness X-rays at the SPring-8 large synchrotron radiation facility to observe TIG welding in progress, the lab has clarified how microstructures form and how solidification cracking develops. With a 3D visualization system, it also investigates how the stir zone and defects form during friction stir welding.
Analysis of Joining Interface Structures
In metals such as pure copper and pure aluminum, the lab uses liquid CO2 to freeze the microstructure during friction stirring, then heat-treats it to investigate how the microstructure forms. In Mg alloys, it has clarified the mechanism by which texture forms.
MembersFaculty
The members of the Joining Interface Mechanisms Lab consist of faculty, project researchers, researchers, administrative assistants, and doctoral, master's, and undergraduate students.As of 2025
- ProfessorHidetoshi Fujii
- Project ProfessorKosaku Ushioda
- Project ProfessorMuneaki Mukuda
- Associate ProfessorMasakazu Mori
- Project Associate ProfessorYoshiaki Morisada
- Project LecturerYoshihiro Aoki
- Assistant ProfessorKyosuke Yamashita
- Assistant ProfessorSharma Abhishek
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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 welding data monitoring at NASA MSFC (Marshall Space Flight Center) in a video by NASA-MSFC 05” NASA/MSFC / Public domain (cropped)
- Interface Control and Formation Mechanisms in Friction Joining: “Fillet joint friction stir welding (FSW) equipment for welding the fillet joint of an electric vehicle frame” Hwanjin Kim,1 Kwangjin Lee,2Jaewoong Kim,3 Changyeon Lee,4 Yoonchul Jung5 and Sungwook Kang,6* 1 Department of Mechanical Engineering, Gyeongsang National University, Jinju 52828, Korea 2 Carbon Materials Application R&D Group, Korea Institute of Industrial Technology, Jeonju 54853, Korea 3 Smart Mobility Materials and Components R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Korea 4 Technical Center: Daejoo Kores Co., LTD., Wanju 55316, Korea 5 Dongnam Division, Korea Institute of Industrial Technology, Busan 46938, Korea 6 Precision Mechanical Process and Control R&D Group, Korea Institute of Industrial Technology, Jinju 52845, Korea * Author to whom correspondence should be addressed. / CC BY 4.0 (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 Molten Pools Form: “SPring-8” Koji101 / CC BY 3.0 (cropped)
- Related lab (Welding and Joining Functional Design Lab [Joining and Welding Research Institute]): “Shielded Metal Arc Welding” Weldscientist / CC BY-SA 4.0 (cropped)
- Related lab (Energy Conversion Mechanisms Lab [Joining and Welding Research Institute]): “Plasma spraying process” Student-julia-pwr / CC BY-SA 4.0 (cropped)
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- Related lab (Process Metallurgy Lab): “US Army soldier welding two metal pieces, Fort Gregg-Adams, Virginia, March 2025” Juan F. Jimenez, Army / Public domain (cropped)
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