Effect of Micro Solidification Crack on Mechanical Performance of Remote Laser Welded AA6063 Fillet Lap Joint in Automotive Battery Tray Construction
AuthorsSun, Tianzhu; email: Tianzhu.firstname.lastname@example.org
Franciosa, Pasquale; email: P.Franciosa@warwick.ac.uk
Liu, Conghui; email: Conghui.email@example.com
Pierro, Fabio; email: firstname.lastname@example.org
Ceglarek, Darek; email: D.J.Ceglarek@warwick.ac.uk
MetadataShow full item record
AbstractRemote laser welding (RLW) has shown a number of benefits of joining 6xxx aluminium alloys such as high processing speed and process flexibility. However, the crack susceptibility of 6xxx aluminium alloys during RLW process is still an open problem. This paper experimentally assesses the impact of transverse micro cracks on joint strength and fatigue durability in remote laser welding of AA6063-T6 fillet lap joints. Distribution and morphology of transverse micro cracks were acquired by scanning electron microscope (SEM) on cross-sections. Grain morphology in the weld zone was determined by electron backscatter diffraction (EBSD) while static tensile and dynamic fatigue tests were carried out to evaluate weld mechanical performance. Results revealed that increasing welding speed from 2 m/min to 6 m/min did not introduce additional transverse micro cracks. Additionally, welding at 2 m/min resulted in tensile strength improvement by 30% compared to 6 m/min due to the expansion of fusion zone, measured by the throat thickness, and refinement of columnar grains near fusion lines. Furthermore, the weld fatigue durability is significantly higher when fracture occurs in weld root instead of fusion zone. This can be achieved by increasing weld root angle with optimum weld fatigue durability at around 55°.
CitationApplied Sciences, volume 11, issue 10, page e4522
DescriptionFrom MDPI via Jisc Publications Router
History: accepted 2021-05-07, pub-electronic 2021-05-15
Publication status: Published
Funder: High Value Manufacturing Catapult; Grant(s): : Chamaeleon - New lightweight Materials and Processing Technologies for Common Lightweight Architecture of Electric and Hybrid Powertrain Systems
Funder: Innovate UK; Grant(s): LIBERATE: Lightweight Innovative Battery Enclosures using Recycled Aluminium Technologies
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