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Plasma Engineering Lab [Joining and Welding Research Institute]
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The lab studies welding arc plasma through measurement and simulation.
AboutAbout the lab
Unraveling the behavior of arc plasma
The Tanaka Lab studies the characteristics and control of high-density energy sources, and the optimization of energy transport.
It also investigates the interaction between high-density energy sources and materials, and explores new high-density energy sources for high-precision, highly functional materials processing.
It examines the generation, control, and heat transport phenomena of arc plasma, a representative high-density energy source, from both physical and chemical perspectives.
On the lab's website, it is introduced under the name "Energy Control Science Division (Tanaka Lab)."
Key terms
- Arc plasma
- High-temperature plasma exceeding 10,000 °C that is generated between an electrode and the base metal and used as a heat source in welding
- Weld pool
- The region formed when the base metal melts during welding. Convection within it determines the shape of the penetration
- Particle method
- A numerical analysis method with simple discretization that can also handle phenomena involving large deformation, which are difficult for methods that use computational grids
NewsLab news
A paper with a master's student as first author was published in ISIJ International
Professor Tanaka and Lecturer Komen received the Encouragement Award for Welding Physics and Technology
A master's student received the Outstanding Research Presentation Award from the Japan Welding Society
Professor Tanaka received The CAWE Contribution Award
Professor Tanaka received the Encouragement Award for Welding Physics and Technology
ResearchResearch themes
The lab investigates, from the fundamentals, the characteristics and control of high-density energy sources and their interaction with materials, and explores new high-density energy sources for high-precision, highly functional materials processing. Focusing on the generation, control, and heat transport of arc plasma, it approaches these topics through both experimental measurement and numerical simulation.
*Illustrative imageMeasuring the motion of arc plasma during welding
In gas metal arc welding, arc plasma exceeding 10,000 °C changes dynamically as droplets are transferred. The lab measures the state of the plasma using temperature measurement based on imaging spectroscopy, and investigates its relationship with droplet transfer.
*Illustrative imageCalculating weld pool flow with a particle method
The lab investigates convection in the weld pool, formed when the base metal melts during welding, through numerical simulation using a particle method. This approach can also handle metal melting and re-solidification, and the lab works on modeling a variety of phenomena in welding processes.
*Illustrative imageHow metal vapor is transported in TIG welding
In TIG welding, it has become clear that metal vapor emitted from the molten metal may be carried through the arc plasma to near the electrode. The lab investigates this transport using imaging spectroscopic measurement, which captures the emission of specific particles in two-dimensional images.
*Illustrative imageAnalysis of TIG welding with a constricted nozzle
The lab uses numerical simulation to study the arc plasma in TIG welding with a constricted nozzle, a method proposed for welding extremely thin metal sheets. It has been shown that increasing the flow speed of the inner shielding gas constricts the arc and raises its temperature.
MembersFaculty
The Tanaka Lab consists of faculty members, a secretary, and doctoral, master's, and undergraduate students.As of 2025
- ProfessorManabu Tanaka
- LecturerHisaya Komen
- Assistant ProfessorShinichi Tashiro
VoicesStudent voices
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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: “US Air Force (USAF) Technical Sergeant (TSGT) Jeffrey Wright, Aircraft Metal Technician, 52nd Equipment Maintenance Squadron (EMS), uses plasma arc cutting torch to destroy a 30mm g - DPLA - 08156ad581284cc3e5ed4337a5cb0c55” Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994 / Public domain (cropped)
- Measuring the motion of arc plasma during welding: “Gas Metal Arc Welding (Mig)” Weldscientist / CC BY-SA 4.0 (cropped)
- Calculating weld pool flow with a particle method: “Molten Metal Pouring from a Ladle” Mnooralam11 / CC BY 4.0 (cropped)
- How metal vapor is transported in TIG welding: “TIG welding” Mak04 at Slovenian Wikipedia / Public domain (cropped)
- Analysis of TIG welding with a constricted nozzle: “TIG-toorts” Erik Wannee / CC0 (cropped)
- Related lab (Energy Conversion Mechanisms Lab [Joining and Welding Research Institute]): “Plasma spraying process” Student-julia-pwr / CC BY-SA 4.0 (cropped)
- Related lab (Plasma Properties and Engineering Lab): “LPP - Laboratoire de Physique des Plasmas - UMR 764822” Ecole polytechnique / Paris / France / CC BY-SA 2.0 (cropped)
- Related lab (Laser Processing Lab [Joining and Welding Research Institute]): “CNC Laser Cutting Machine” S zillayali / CC BY 3.0 (cropped)
- Related lab (Microjoining Engineering Lab [Joining and Welding Research Institute]): “Soldering a 0805” Aisart / CC BY-SA 3.0 (cropped)
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