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Understanding novel gap-bridged remote laser welded (RLW) joints for automotive high-rate and temperature applications
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Das, Abhishek, Masters, Iain and Williams, David K. (2020) Understanding novel gap-bridged remote laser welded (RLW) joints for automotive high-rate and temperature applications. International Journal of Mechanical Sciences . 106043. doi:10.1016/j.ijmecsci.2020.106043 (In Press)
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Official URL: https://doi.org/10.1016/j.ijmecsci.2020.106043
Abstract
This paper investigates the microstructure, high-rate and temperature dependent tensile behaviour of fillet edge joints produced by novel ‘gap-bridged’ remote laser welding (RLW) using an automotive grade aluminium alloy AA6014, commercially known as AC-170PX, extensively used for automotive skin panel applications. Three part-to-part gap-bridged RLW fillet edge welds, produced with different gaps (0.2 mm, 0.4 mm and 0.6 mm) were examined for joint geometry and microstructure. Relatively larger columnar grains resulting from directional solidification were observed in the fusion zone and microhardness was reduced by ~15- 20% due to precipitates disappearance. Moderate (0.1 m/s) to high speed rate (10 m/s) tensile tests performed at room temperature (~23°C) were used to determine high-rate tensile performance. Although the strain rate dependency was found to be low, an increase in tensile extension was obtained. Additionally, the joint tensile performance was evaluated over a range of temperatures between -50°C and 300°C. Using digital image correlation (DIC), fracture strains were obtained in the range from 0.21 to 0.25 for all gap and speed conditions. Fusion zone based finite element simulations were performed using the Johnson-Cook material failure model to predict joint strength. Additionally, the suitability of gap-bridged RLW joints for automotive applications was determined by comparison with two industrial joining methods, self-piercing riveting (SPR) and resistance spot welding (RSW).
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TS Manufactures |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Laser welding , Strains and stresses, Finite element method | ||||||
| Journal or Publication Title: | International Journal of Mechanical Sciences | ||||||
| Publisher: | Pergamon Press | ||||||
| ISSN: | 0020-7403 | ||||||
| Official Date: | 23 August 2020 | ||||||
| Dates: |
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| Date of first compliant deposit: | 29 August 2020 | ||||||
| Article Number: | 106043 | ||||||
| DOI: | 10.1016/j.ijmecsci.2020.106043 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | In Press | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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