Effect of Micro Solidification Crack on Mechanical Performance of Remote Laser Welded AA6063-T6 Fillet Lap Joint in Automotive Battery Tray Construction
| Autor: | Dariusz Ceglarek, Tianzhu Sun, Conghui Liu, Pasquale Franciosa, Fabio Pierro |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
micro solidification cracks
Technology 0209 industrial biotechnology Materials science TL QH301-705.5 QC1-999 chemistry.chemical_element 02 engineering and technology Welding TS remote laser welding law.invention 020901 industrial engineering & automation law Aluminium Ultimate tensile strength General Materials Science Biology (General) Composite material Fillet (mechanics) QD1-999 Instrumentation Fluid Flow and Transfer Processes Physics Process Chemistry and Technology battery tray General Engineering Laser beam welding Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology Durability Computer Science Applications Chemistry Lap joint TA chemistry joint integrity beam oscillation TA1-2040 0210 nano-technology power modulation Electron backscatter diffraction |
| Zdroj: | Applied Sciences, Vol 11, Iss 4522, p 4522 (2021) |
| ISSN: | 2076-3417 |
| Popis: | 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°. |
| Databáze: | OpenAIRE |
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