On the influence of laser beam welding parameters for autogenous AA2198 welded joints
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On the influence of laser beam welding parameters for autogenous AA2198 welded joints. / Examilioti, Theano; Kashaev, Nikolai; Enz, Josephin et al.
In: The International Journal of Advanced Manufacturing Technology, Vol. 110, No. 7-8, 01.09.2020, p. 2079-2092.Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - On the influence of laser beam welding parameters for autogenous AA2198 welded joints
AU - Examilioti, Theano
AU - Kashaev, Nikolai
AU - Enz, Josephin
AU - Klusemann, Benjamin
AU - Alexopoulos, Nikolaos D.
PY - 2020/9/1
Y1 - 2020/9/1
N2 - The effects of different autogenous laser beam welding process parameters on the fusion zone (FZ) geometry, microstructure, and tensile mechanical properties were investigated for 5-mm-thick AA2198 alloy sheets. Porosity formation and hot cracking are observed for low laser powers and welding velocities, while the porosity level is essentially reduced with increasing laser power. The characteristic cross-sectional geometry of the welded joints changes with increasing laser power, taking shapes from narrow V shape to rectangular I shape, and the results are discussed based on the “closed” and “open” keyhole formation during laser beam welding. A methodology is exploited in terms of quantifying the geometrical dimensions of the cross-section of the FZ in order to promote the welded joints with a narrow width as well as with a rectangular shape. The optimal process parameters, leading to FZ close to the desirable rectangular I shape and with a low number of defects, are identified. Microstructural analyses reveal a pronounced transition zone in between the FZ and the heat-affected zone, which is subdivided into two narrow zones, the partially melted zone (PMZ) and the equiaxed zone. The narrow width of the FZ and PMZ, as well as the rectangular shape of the FZ, enables the autogenous welded joint to reach good tensile deformation properties.
AB - The effects of different autogenous laser beam welding process parameters on the fusion zone (FZ) geometry, microstructure, and tensile mechanical properties were investigated for 5-mm-thick AA2198 alloy sheets. Porosity formation and hot cracking are observed for low laser powers and welding velocities, while the porosity level is essentially reduced with increasing laser power. The characteristic cross-sectional geometry of the welded joints changes with increasing laser power, taking shapes from narrow V shape to rectangular I shape, and the results are discussed based on the “closed” and “open” keyhole formation during laser beam welding. A methodology is exploited in terms of quantifying the geometrical dimensions of the cross-section of the FZ in order to promote the welded joints with a narrow width as well as with a rectangular shape. The optimal process parameters, leading to FZ close to the desirable rectangular I shape and with a low number of defects, are identified. Microstructural analyses reveal a pronounced transition zone in between the FZ and the heat-affected zone, which is subdivided into two narrow zones, the partially melted zone (PMZ) and the equiaxed zone. The narrow width of the FZ and PMZ, as well as the rectangular shape of the FZ, enables the autogenous welded joint to reach good tensile deformation properties.
KW - Engineering
KW - AA2198
KW - Aluminum-lithium alloy
KW - Laser beam welding
KW - Microhardness
KW - Tensile strength
UR - http://www.scopus.com/inward/record.url?scp=85090065173&partnerID=8YFLogxK
U2 - 10.1007/s00170-020-05893-8
DO - 10.1007/s00170-020-05893-8
M3 - Journal articles
AN - SCOPUS:85090065173
VL - 110
SP - 2079
EP - 2092
JO - The International Journal of Advanced Manufacturing Technology
JF - The International Journal of Advanced Manufacturing Technology
SN - 0268-3768
IS - 7-8
ER -