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Seminars
Friction Stir Welding of Aluminum Alloys – Microstructure/Property Characterization and Relationships
W. Baeslack
Dean, College of Engineering
Ohio State University
Date: Thursday,
November 17, 2005
Time: 3:30 pm
Location: ASEC 122
Additional Information:
Refreshments at 3:15 p.m.
Additional Information Contact: Dr. S. I. Hariharan, 330.972.6580 |
Friction
Stir Welding (FSW) is a relatively new solid-state joining process
in which a rotating tool, comprised of a shoulder and a probe,
is plunged into the joint and traversed along the weld line to
form a weld. A typical FS weld consists of: a thermo-mechanically
affected zone (TMAZ), which includes the dynamically-recrystallized
stir zone (SZ) and the deformed but not recrystallized surrounded
region, the heat-affected zone (HAZ) and the unaffected base
material (BM). In this presentation, the friction-stir welding
characteristics of three different aluminum alloys will be discussed,
a conventional 2024-T3 Al-Cu alloy, a more advanced 2195-T8 Al-Li
alloy, and an advanced, rapidly-solidified 8009 Al-Fe-V-Si alloy.
Optimum welding parameters, viz. tool rotation, welding speed,
plunge depth and tool design were established for friction stir
welding (FSW) 1 mm thick 2024-T3 and 2195-T8 by using design
of experiments and the effects of these parameters on the weld
microstructure and mechanical properties will be elaborated.
FSW’s were also produced in the 6.3 mm thick 8009 plate
using a range of tool rotational and traversing speeds. Various
regions of the welds were characterized using light, scanning-electron
and transmission-electron microscopy and changes in the type,
size and density of precipitates and intrinsic relationship to
the changes in hardness across the weld will be highlighted and
discussed.
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Dr.
W. Baeslack III became Dean of the College of Engineering at
The Ohio State University on July 1, 2004. He holds appointments
as a Professor of Industrial, Welding and Systems Engineering,
and Materials Science and Engineering. Dr. Baeslack received
his B.S. and M.S. engineering degrees in Welding Engineering
from The Ohio State University and his Ph.D. degree in Materials
Engineering from Rensselaer Polytechnic Institute. Prior to
joining the OSU faculty in 1982, he was employed as a Technical
Area Manager at the Air Force Materials Laboratory. As an OSU
faculty member, Dr. Baeslack served as Professor and Chair
of the Department of Welding Engineering from 1991-1994, Associate
Dean for Research and College Development from 1994-1998, and
Interim Vice President for Research and President of the OSU
Research Foundation from 1998-1999. In 1999, he returned to
Rensselaer Polytechnic Institute to serve as Dean of the School
of Engineering. In 1989-90, Dr. Baeslack spent a sabbatical
leave in the Materials Department at The Welding Institute
in Cambridge, England. He is a Fellow of ASM International,
The Welding Institute and the American Welding Society. Dr.
Baeslack is internationally recognized for his research on
the materials science and engineering aspects of joining advanced
materials, including titanium, aluminum and nickel-base alloys,
intermetallics and metal-matrix composites. He has
received over $5M in grants from the DoD, NSF, the Ohio Edison
Program,
national laboratories and industry. He and his students have
authored over one hundred and fifty journal and proceedings
articles. Dr. Baeslack has selectively consulted for a diversity
of high technology companies, including Babcock and Wilcox
Corporation, GE Aircraft Engines, and Goodrich Aerospace Corporation.
Dr. Baeslack has been involved in professional societies and
has chaired major committees in ASM International, AWS, and
the Welding Research Council. He is a Professional Engineer
in the State of Ohio, and a member of the National Societies
of Professional Engineers. During 2004-2005 he served as a
Vice President and Chair of the Professional Engineers in Education
(PEE) Committee. As a Senior Materials Scientist and reserve
officer assigned to the Materials Directorate at the Air Force
Research Laboratory from 1982 to 2003, Dr. Baeslack performed
research on advanced material processing, provided DoD-wide
consultation on aerospace materials, and promoted technology
transfer from the Air Force to industry.
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