Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy
Laser beam shaping technology has advanced remote laser welding applications, yet welding AA6xxx alloys remains challenging due to their sensitivity to cracking. Recent studies on these alloys have focussed on axisymmetric shapes, with a limited understanding of molten flow dynamics and microstructu...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
|
| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000395 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832591829681307648 |
|---|---|
| author | Venkat Vivek Pamarthi Tianzhu Sun Abhishek Das Qamar Hayat Alexander Griffiths Lewis Johnson Pasquale Franciosa |
| author_facet | Venkat Vivek Pamarthi Tianzhu Sun Abhishek Das Qamar Hayat Alexander Griffiths Lewis Johnson Pasquale Franciosa |
| author_sort | Venkat Vivek Pamarthi |
| collection | DOAJ |
| description | Laser beam shaping technology has advanced remote laser welding applications, yet welding AA6xxx alloys remains challenging due to their sensitivity to cracking. Recent studies on these alloys have focussed on axisymmetric shapes, with a limited understanding of molten flow dynamics and microstructural evolution in the context of non-axisymmetric shapes. This study examines the impact of tailing and axisymmetric laser beam shapes on steering microstructure, and cracking mitigation in AA6082 alloy by combining multiphysics CFD simulation and experimental observations. Two sets of beam shapes were investigated: (1) four axisymmetric core-to-ring beam shapes with varying ring diameter, and power, and (2) a tailing beam shape with a 3 mm elongated tail. The findings indicate that introducing a 580 µm ring to the core beam reduces crack formation by lowering thermal gradients; however, increasing the power of the ring beam at a constant diameter, coarsens the microstructure, producing axial columnar grains with higher crack sensitivity. Expanding the ring beam diameter to 1200 µm reduced molten flow and thermal gradients, resulting in decreased cracking and increased tensile strength by 36%, compared to the core-only shape. The tailing shape beam further lowered thermal gradients owing to the larger molten pool and elongated tail, achieving a 62% grain size reduction compared to the core-only shape. |
| format | Article |
| id | doaj-art-3a5ad0a70f2145edb98c1f59d40db332 |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-3a5ad0a70f2145edb98c1f59d40db3322025-01-22T05:40:58ZengElsevierMaterials & Design0264-12752025-02-01250113619Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloyVenkat Vivek Pamarthi0Tianzhu Sun1Abhishek Das2Qamar Hayat3Alexander Griffiths4Lewis Johnson5Pasquale Franciosa6WMG, The University of Warwick, Coventry CV4 7AL, United Kingdom; Corresponding authors.WMG, The University of Warwick, Coventry CV4 7AL, United Kingdom; Corresponding authors.Department of Mechanical Engineering, Indian Institute of Technology Delhi, 110016 New Delhi, IndiaWMG, The University of Warwick, Coventry CV4 7AL, United KingdomPowerPhotonic, Dalgety Bay, KY119PF, United KingdomPowerPhotonic, Dalgety Bay, KY119PF, United KingdomWMG, The University of Warwick, Coventry CV4 7AL, United KingdomLaser beam shaping technology has advanced remote laser welding applications, yet welding AA6xxx alloys remains challenging due to their sensitivity to cracking. Recent studies on these alloys have focussed on axisymmetric shapes, with a limited understanding of molten flow dynamics and microstructural evolution in the context of non-axisymmetric shapes. This study examines the impact of tailing and axisymmetric laser beam shapes on steering microstructure, and cracking mitigation in AA6082 alloy by combining multiphysics CFD simulation and experimental observations. Two sets of beam shapes were investigated: (1) four axisymmetric core-to-ring beam shapes with varying ring diameter, and power, and (2) a tailing beam shape with a 3 mm elongated tail. The findings indicate that introducing a 580 µm ring to the core beam reduces crack formation by lowering thermal gradients; however, increasing the power of the ring beam at a constant diameter, coarsens the microstructure, producing axial columnar grains with higher crack sensitivity. Expanding the ring beam diameter to 1200 µm reduced molten flow and thermal gradients, resulting in decreased cracking and increased tensile strength by 36%, compared to the core-only shape. The tailing shape beam further lowered thermal gradients owing to the larger molten pool and elongated tail, achieving a 62% grain size reduction compared to the core-only shape.http://www.sciencedirect.com/science/article/pii/S0264127525000395Tailing and axisymmetric laser beam shapesAutogenous laser welding of 6082 aluminium alloyMolten pool flowControl of microstructureSolidification crackingMechanical properties |
| spellingShingle | Venkat Vivek Pamarthi Tianzhu Sun Abhishek Das Qamar Hayat Alexander Griffiths Lewis Johnson Pasquale Franciosa Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy Materials & Design Tailing and axisymmetric laser beam shapes Autogenous laser welding of 6082 aluminium alloy Molten pool flow Control of microstructure Solidification cracking Mechanical properties |
| title | Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy |
| title_full | Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy |
| title_fullStr | Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy |
| title_full_unstemmed | Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy |
| title_short | Tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded AA6082 alloy |
| title_sort | tailing and axisymmetric static laser beam shapes to steer microstructure and improve mechanical properties of autogenously laser welded aa6082 alloy |
| topic | Tailing and axisymmetric laser beam shapes Autogenous laser welding of 6082 aluminium alloy Molten pool flow Control of microstructure Solidification cracking Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525000395 |
| work_keys_str_mv | AT venkatvivekpamarthi tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT tianzhusun tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT abhishekdas tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT qamarhayat tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT alexandergriffiths tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT lewisjohnson tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy AT pasqualefranciosa tailingandaxisymmetricstaticlaserbeamshapestosteermicrostructureandimprovemechanicalpropertiesofautogenouslylaserweldedaa6082alloy |