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*Terumasa KAWASHIMA
Graduate School of Engineering, Osaka University
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Tomokazu SANO
Graduate School of Engineering, Osaka University
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Akio HIROSE
Graduate School of Engineering, Osaka University
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Seiichirou TSUTSUMI
Joining and Welding Research Institute, Osaka University
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Kiyotaka MASAKI
National institute of technology, Okinawa college
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Hisashi HORI
Nippon Light Metal Company, Ltd.