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Nagamatsu Lab
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A lab that studies metal 3D printing, in which metal is built up layer by layer to form parts.
AboutAbout the lab
Building up metal to create new manufacturing technologies.
The Nagamatsu Lab studies manufacturing and processing, with metal 3D printing as its core theme.
This technology builds products directly by stacking molten metal in three dimensions. It requires no mold preparation and may reduce material waste.
The lab develops new forming techniques and evaluates the microstructure and strength properties of the materials it produces, aiming to create high-value-added processing technologies.
The lab invites students interested in a wide range of activities, including equipment design, machining with machine tools, and evaluation of material properties, to join the work.
Key terms
- Metal 3D printing
- A technology that builds products directly by stacking molten metal in three dimensions. It may allow parts to be made without preparing a mold.
- WAAM
- Wire arc additive manufacturing. It forms a shape by melting metal wire with an electric arc and stacking it layer by layer.
- Forced cooling
- A method of releasing heat by bringing a copper block into contact with the metal during deposition. It allows the build to continue with almost no pause.
- Mechanical bonding
- A way of joining materials by interlocking their shapes, as distinct from metallurgical bonding.
NewsLab news
A paper on temperature analysis of metal additive manufacturing with forced cooling was published in the Journal of Advanced Joining Processes
A paper on research into depositing titanium onto magnesium alloy was published in The International Journal of Advanced Manufacturing Technology
A paper on high-speed deposition of magnesium alloy was published in the Journal of Advanced Joining Processes
A master's student received the Mazak Foundation Outstanding Paper Award
A paper on the effects of forced cooling and interlayer pauses on tensile properties was published in The International Journal of Advanced Manufacturing Technology
ResearchResearch themes
The lab studies metal 3D printing as its core theme, linking the development of new forming techniques with the evaluation of the microstructure and strength properties of the materials produced. Using WAAM, which melts wire with an electric arc and stacks it layer by layer, the lab works on high-speed deposition of magnesium alloys and on layered builds that combine different metals.
*Illustrative imageHigh-speed deposition with forced cooling
This research deposits magnesium alloy while bringing a copper block into contact with it for forced cooling. It shows that high-speed deposition, which continues with almost no pause in the build, can be combined with improved strength and ductility.
*Illustrative imageLayered deposition of dissimilar metals
The lab works on layered deposition of dissimilar metals, such as building titanium on top of aluminum alloys or magnesium alloys. Using a build strategy based on mechanical bonding, it has succeeded in depositing layers that were previously difficult to achieve.
*Illustrative imageUnderstanding the properties of friction surfacing
The lab investigates the properties of friction surfacing performed with a vertical machining center. In experiments depositing aluminum alloy in multiple layers, it evaluates load controllability, material efficiency, and bonding quality.
*Illustrative imageHybrid deposition combining solid-state and fusion processes
The lab is developing a deposition method that combines solid-state joining with fusion joining. It deposits 5000-series aluminum alloy onto an SS400 base material and examines the strength of the joint interface.
MembersFaculty
The Nagamatsu Lab consists of faculty members and master's and undergraduate students.As of 2026
- Tenure-Track Assistant ProfessorHideaki Nagamatsu
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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: “Панфилов Александр - Wire Arc Additive Manufacturing (ИФПМ СО РАН)” Панфилов Александр / CC BY 4.0 (cropped)
- High-speed deposition with forced cooling: “Material properties of metal powders for use in additive manufacturing ( )” National Institute of Standards and Technology / Public domain (cropped)
- Layered deposition of dissimilar metals: “Alloy and metal samples - Beryllium-Copper, Inconel, Steel, Titanium, Aluminum, Magnesium” Bill Abbott / CC BY-SA 2.0 (cropped)
- Understanding the properties of friction surfacing: “Friction between surfaces” CaoHao / CC BY-SA 4.0 (cropped)
- Hybrid deposition combining solid-state and fusion processes: “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)
- Related lab (Masuda Lab): “3D-Laserscanner on tripod” Dr. Schorsch / CC BY-SA 3.0 (cropped)
- Related lab (Matsumura Lab): “GRC-2003-C-02070~orig” NASA GRC / Public domain (cropped)
- Related lab (Sogabe Lab): “High voltage switchgear” Novoklimov / CC0 (cropped)
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