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Masahiro Fukumoto

Affiliation Department of Mechanical Engineering
Title Professor
Fields of Research Materials Processing / Materials Joining & Welding / Surface Modification
Degree Dr. of Engineering (Keio University)
Academic Societies Japan Society of Mechanical Engineers / Japan Welding Society / Japan Thermal Spray Society / ASM International / Japan Metal Society / Society of Automotive Engineers of Japan
E-mail fukumoto@
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Development of advanced joining process is a main objective of my research. It involves both advanced surface modification technology and advanced joining process for the bulk materials. Thermal spraying, cold spray and aero-sol deposition are the main in the surface modification process for the materials. A common feature in these three processes is a thick coating formation with Particles Deposition. Coating formation mechanism in the PD process is the current interest. Friction stir welding, on the other hand, is the main in the bulk joining. Non melting plastic flowing process instead of regular fusion welding should have a inifinite possibility in the future welding or joining process field. Joining in dissimilar metals by friction stirring is the main interest in this theme.

Theme1:Development of Particle Deposition Process


In the flattening behavior of the sprayed particle onto the substrate surface, critical conditions were recognized both in the substrate temperature and ambient pressure. A transition temperature, Tt, and transition pressure, Pt, were defined and introduced respectively for those critical conditions. Three-dimensional transition curvature by combining both the Tt and Pt dependence was proposed as a controlling principle of the thermal spray process. On the other hand, the particle melting in the ordinal thermal spray process has been recognized as a necessary evil. To overcome this problem, a new direction in coating technological development by using non-fusion solid particles has been tried recently, typically called cold spray CS or aerosol deposition AD process. As these processes have common characteristic for all, a thick coating formation by the deposition of several micron size particles are aiming to develop in my research.


Thermal spray, Transition temperature, Three dimensional transition curvature

Theme2:Dissimilar Materials Welding by Friction Stirring


We have established a joining process between dissimilar metals by applying a friction stirring. In the process, plastic flowing by friction stirring is formed preferentially in the softer metal materials and joining between dissimilar metals can be attained by the interaction of plastic flowed softer metal against a harder metal surface. Based on the results, application possibility of friction stir spot welding to the joining between metal and ceramic material was verified. The joining process conditions were optimized and joining mechanism in the materials system was clarified. As a result, spot joining between metal and ceramics by friction stirring was achieved. As the shear strength of the joint was not so high, optimization in the joining condition have to be clarified more in the future study.


FSW, Dissimilar material, Welding

Title of class

Joining and Surafacing of Materials (M41630070)
Advances in Material Science and Manufacturing (M41630340)
Advanced Manufacturing Processes (D51030030)
Japanese Life Today (M40030050)

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