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Microstructure and mechanical properties of gap-bridged remote laser welded (RLW) automotive grade AA 5182 joints
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Das, Abhishek, Butterworth, Ian, Masters, Iain and Williams, D. K. (2018) Microstructure and mechanical properties of gap-bridged remote laser welded (RLW) automotive grade AA 5182 joints. Materials Characterization, 145 . pp. 697-712. doi:10.1016/j.matchar.2018.09.035
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Official URL: https://doi.org/10.1016/j.matchar.2018.09.035
Abstract
This study reports an investigation on the effects of process parameters and part-to-part gaps on joint quality
when producing filet edge joint using the novel gap-bridged remote laser welding (RLW) technique. Joint
geometries, microstructural characteristics, scanning electron micrographs (SEM), electron backscatter diffraction (EBSD) maps, microhardness and tensile strength behaviours are reported for the autogenous RLW filet
edge welds in an aluminium alloy, AA5182, used extensively for automotive structural applications. It has been
found that laser process parameters and part-to-part gap directly inflence key geometric features including
penetration, leg length and throat thickness of the weld fusion zone, and subsequently, tensile performance. Lap
shear test results demonstrate that both laser power and speed greatly inflence the maximum mean load at
failure and the corresponding tensile extension. Furthermore, both the weld macrostructure sections and lap
shear strength confirm that the gap-bridging RLW technique can be successfully applied to close the part-to-part
gaps. The microhardness profiles reveal that under zero gap and gap-bridged conditions the AA 5182 alloy base
material has lower hardness (5–10%) compared to fusion zone. The EBSD maps exhibit the grain distribution
from the base material to fusion zone under different gap conditions. As a result of directional cooling, a plane of
weakness was formed at the junction of the horizontal and vertical grain developments when part-to-part gaps
were employed. This study shows that the gap-bridging RLW technique is capable of creating good quality performance joints with automotive grade AA5182 aluminium alloy.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TS Manufactures |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | Materials Characterization | ||||||||
Publisher: | Elsevier | ||||||||
Official Date: | November 2018 | ||||||||
Dates: |
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Volume: | 145 | ||||||||
Page Range: | pp. 697-712 | ||||||||
DOI: | 10.1016/j.matchar.2018.09.035 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 11 October 2018 |
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