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Effect of micro solidification crack on mechanical performance of remote laser welded AA6063-T6 fillet lap joint in automotive battery tray construction
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Sun, Tianzhu, Franciosa, Pasquale, Liu, Conghui, Pierro, Fabio and Ceglarek, Dariusz (2021) Effect of micro solidification crack on mechanical performance of remote laser welded AA6063-T6 fillet lap joint in automotive battery tray construction. Applied Sciences, 11 (10). 4522. doi:10.3390/app11104522
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WRAP-effect-micro-solidification-crack-mechanical-performance-remote-laser-welded-AA6063-T6-fillet-lap-joint-automotive-battery-tray-construction-Ceglare-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (9Mb) | Preview |
Official URL: http://dx.doi.org/10.3390/app11104522
Abstract
Remote 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 extruded 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°.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TS Manufactures |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Electric vehicles -- Batteries -- Equipment and supplies , Laser welding, Welded joints -- Cracking | ||||||
| Journal or Publication Title: | Applied Sciences | ||||||
| Publisher: | MDPI | ||||||
| ISSN: | 2076-3417 | ||||||
| Official Date: | 15 May 2021 | ||||||
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| Volume: | 11 | ||||||
| Number: | 10 | ||||||
| Article Number: | 4522 | ||||||
| DOI: | 10.3390/app11104522 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| RIOXX Funder/Project Grant: |
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