TY - GEN
T1 - Friction stir spot welding phenomena in Al alloy 6061
AU - Sato, Yutaka S.
AU - Fujimoto, Mitsuo
AU - Abe, Natsumi
AU - Kokawa, Hiroyuki
PY - 2010
Y1 - 2010
N2 - Friction stir spot welding (FSSW), developed based on principle of friction stir welding, has been paid attention as a new solid-state spot welding process. Since FSSW can produce high-quality weld in Al alloys more easily than resistance spot welding, this process has been already used for construction of Al components in the automotive industries. Despite the large industrial interests in FSSW, fundamental knowledge on welding phenomena of this process has not been fully understood. In this study, FSSW phenomena, such as the consolidation mechanism, the microstructural evolution and the material flow, were examined in Al alloy 6061. This study clarified that the elliptical zone found in the vicinity of the pin hole on the cross section was characterized by the initially lapped surface of two sheets. Moreover, the following material flow was proposed; capture of the upper material with the threads on the pin surface, spiral flow along the tool rotation, and then release at the tip of the pin.
AB - Friction stir spot welding (FSSW), developed based on principle of friction stir welding, has been paid attention as a new solid-state spot welding process. Since FSSW can produce high-quality weld in Al alloys more easily than resistance spot welding, this process has been already used for construction of Al components in the automotive industries. Despite the large industrial interests in FSSW, fundamental knowledge on welding phenomena of this process has not been fully understood. In this study, FSSW phenomena, such as the consolidation mechanism, the microstructural evolution and the material flow, were examined in Al alloy 6061. This study clarified that the elliptical zone found in the vicinity of the pin hole on the cross section was characterized by the initially lapped surface of two sheets. Moreover, the following material flow was proposed; capture of the upper material with the threads on the pin surface, spiral flow along the tool rotation, and then release at the tip of the pin.
KW - Al alloy
KW - Friction stir spot welding
KW - Material flow
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=75849119680&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=75849119680&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.638-642.1243
DO - 10.4028/www.scientific.net/MSF.638-642.1243
M3 - Conference contribution
AN - SCOPUS:75849119680
SN - 0878492941
SN - 9780878492947
T3 - Materials Science Forum
SP - 1243
EP - 1248
BT - THERMEC 2009
A2 - Chandra, Tara
A2 - Chandra, Tara
A2 - Chandra, Tara
A2 - Wanderka, N.
A2 - Wanderka, N.
A2 - Wanderka, N.
A2 - Reimers, Walter
A2 - Reimers, Walter
A2 - Reimers, Walter
A2 - Ionescu, M.
A2 - Ionescu, M.
A2 - Ionescu, M.
PB - Trans Tech Publications Ltd
T2 - 6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
Y2 - 25 August 2009 through 29 August 2009
ER -