Introduction of the Fellows

Dr. Eng.Specialty; Welding and joining technologiesKoichi YASUDAWelding and joining technologies

Welds are aggregates of microscopic dissimilar materials whose quality continuously changes

Welds have a different thermal history and composition compare to those of base materials, and their metallurgical characteristics are always in a non-equilibrium state due to rapid heating and cooling. In addition to these features, they show very complicated deformation and mechanical behaviors due to the effects of thermal strain and stresses. In other words, welds are aggregates of microscopic dissimilar materials whose quality continuously changes even they are not at the joints of dissimilar materials.

We assess these complicated phenomena and behaviors of welds with professional observations and aim to clarify their mechanisms and offer proposals on a problem-solving basis. We are also actively working on the development of new welding and joint processes along with the introduction of multi-material processes. In this way, we provide our clients with solutions that can meet their new needs in a timely manner.

Koichi YASUDAKoichi YASUDA
PROFILE

Koichi YASUDA
Dr. Eng.
Specialty; Welding and joining technologies

Major work experience

2014 - present: Fellow of JFE-TEC
2007 - 2014: Principal Researcher, JFE Steel Corporation
2003 - 2007: General Manager, Joining & Strength Research Dept., JFE Steel Corporation
1991 - 1993: Visiting Researcher, The Welding Institute (TWI), U.K.

Other professional activities

  • 2013 - 2014: Director, the Japan Welding Engineering Society
  • 2012 - 2014: Representative Director (vice president), Japan Welding Society
  • 2005 - 2012: Director, Japan Welding Society
  • 2009 - present: Guest Professor, Joining and Welding Research Institute, Osaka University
  • 2008 - present: Lecturer, School of Fundamental Science and Engineering, Waseda University

Academic degrees

  • 2005: Received a Dr. Eng. from Osaka University
  • 1978: Completed studies at the graduate school of Osaka University

Awards

  • The Minister of Education, Culture, Sports, Science and Technology: Prize for Science and Technology
  • The Okochi Memorial Foundation: Okochi Memorial Foundation Technology Prize
  • The Iron and Steel Institute of Japan: Scientific Achievement Commemorative Prizes (Shiraishi Commemorative Prize and Mishima Medal)
  • The Japan Institute of Metals and Materials: Technical Development Award
  • Japan Welding Society: Kikundo Tanaka Award, Sasaki Award, the Promotion of Welding Research Award, etc.
  • The Japan Welding Engineering Society: Technical Award (main prize), Technology Development Incentive Award, Outstanding Welding Invention Award

Representative paper

  • K.Yasuda et al.: Hydrogen Cracking Under Austenitic Stainless Steel Cladding in Overlay Welded Nuclear Vessels, International Conference of American Society for Metals on Current Solutions to Hydrogen Problems in Steels, 1982, p.131
  • K.Yasuda et al.: Korrosionsverhalten bei Rundschweißverbindungen an Rohren aus Nichtrostendem Duplexstahl, ZIS (Zeichen Ingeniöser Schweißtechnik) Mitteilungen, 29 (1987) 3, p229
  • K.Yasuda, R.N.Gunn, and T.G.Gooch : Prediction of Austenite Phase Fraction in Duplex Stainless Steel Weld Metals, International Conference of TWI on Duplex Stainless Steel, Duplex Stainless '94, 2 (1994), p.37
  • K.Yasuda et al.: Effect of REM addition in Wire on CO2 Gas Shielded Arc Phenomenon, Welding International, 23 (2009) 7, p.517

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