Region of Research

  The main research subject is the development of the high density energy source for processing advanced materials having special functions and properties. We undertake fundamental investigations of the properties of the high energy source interacting with materials, and we study advanced control techniques for optimizing the energy transport.
  Major emphasis is placed on the generation, control and energy transport in arc plasmas, which are a high density energy source which have been applied to a variety of materials processing techniques such as welding, cutting, heating, high temperature processing, surface modification and the creation of powders.

Current Research Subjects

  • Generation and control of thermal plasmas, and their application to welding and joining processes
  • Arc physics, molten pool behavior, and transport theory in fusion welding
  • Development of new arc electrodes based on the analysis of electrode-plasma interaction
  • Development of environment-friendly smart arc welding processes
  • Development of new generation material processes using atmospheric pressure plasma
  • Control of arc discharge in lighting and electrical devices




Flux column formation process at a wire tip during a flux cored arc welding ((a) observation result, (b) particle state and (c) temperature distributions of the vertical cross-section of wire and droplet simulated by a particle method). It was simulated that a molten metal-pipe flowed down over the flux column which was formed at a wire tip.

Intensity distribution of metal vapors during helium tungsten inert gas welding on SUS304 stainless steel (distribution of (a) iron atom, (b) monovalent iron ion, (c) chromium atom, (d) monovalent chromium ion, and (e) metal atoms and metal ions in the arc plasma). Using imaging spectroscopic technique, it was revealed that a layer of metal ions was formed near the center of the arc plasma and a layer of metal atoms was formed on the outside.

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