Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding
This paper studied lap welding on 1.5 mm AA6061 and AA5182 aluminum alloy sheets with laser beam circular oscillation. The joint form is commonly used in new energy car bodies to achieve the purpose of reducing weight and combining the strength and toughness of two aluminum alloys. The effects of os...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-11-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785421011297 |
| _version_ | 1819099240512618496 |
|---|---|
| author | Lin Chen Chunming Wang Gaoyang Mi Xiong Zhang |
| author_facet | Lin Chen Chunming Wang Gaoyang Mi Xiong Zhang |
| author_sort | Lin Chen |
| collection | DOAJ |
| description | This paper studied lap welding on 1.5 mm AA6061 and AA5182 aluminum alloy sheets with laser beam circular oscillation. The joint form is commonly used in new energy car bodies to achieve the purpose of reducing weight and combining the strength and toughness of two aluminum alloys. The effects of oscillating frequency on the weld formation, grain structure and mechanical properties were mainly investigated combining with numerical simulation. The asymmetric weld morphology and the influence of frequency on weld formation were studied by energy distribution, temperature histories and keyhole depth. The increase of frequency can cause the actual heat input, linear energy and keyhole depth to decrease, resulting in the molten pool to change from an elongated droplet shape to a nearly elliptic shape, and the transition from keyhole mode to conduction mode, thus the grain size gradually reduced. The columnar crystals width in the left and right sides were different, attributing to the different solidification parameters at the both sides of the same isotherm. The tensile strength can reach the maximum value of 156 MPa, where the lap surface was the main source of crack. The dilution of the strengthening phase and the grain size together affected the internal microhardness distribution of the weld. A wide HAZ (heat affected zone) was presented in the oscillating weld. This work can provide a research basis for the optimization of the weld formation, grain structure and properties of this kind of joint, which has potential application in the new energy vehicles. |
| first_indexed | 2024-12-22T00:43:44Z |
| format | Article |
| id | doaj.art-5240e894900a4898849d2da262ba1448 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-22T00:43:44Z |
| publishDate | 2021-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-5240e894900a4898849d2da262ba14482022-12-21T18:44:36ZengElsevierJournal of Materials Research and Technology2238-78542021-11-011531333148Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap weldingLin Chen0Chunming Wang1Gaoyang Mi2Xiong Zhang3State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaCorresponding author.; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaThis paper studied lap welding on 1.5 mm AA6061 and AA5182 aluminum alloy sheets with laser beam circular oscillation. The joint form is commonly used in new energy car bodies to achieve the purpose of reducing weight and combining the strength and toughness of two aluminum alloys. The effects of oscillating frequency on the weld formation, grain structure and mechanical properties were mainly investigated combining with numerical simulation. The asymmetric weld morphology and the influence of frequency on weld formation were studied by energy distribution, temperature histories and keyhole depth. The increase of frequency can cause the actual heat input, linear energy and keyhole depth to decrease, resulting in the molten pool to change from an elongated droplet shape to a nearly elliptic shape, and the transition from keyhole mode to conduction mode, thus the grain size gradually reduced. The columnar crystals width in the left and right sides were different, attributing to the different solidification parameters at the both sides of the same isotherm. The tensile strength can reach the maximum value of 156 MPa, where the lap surface was the main source of crack. The dilution of the strengthening phase and the grain size together affected the internal microhardness distribution of the weld. A wide HAZ (heat affected zone) was presented in the oscillating weld. This work can provide a research basis for the optimization of the weld formation, grain structure and properties of this kind of joint, which has potential application in the new energy vehicles.http://www.sciencedirect.com/science/article/pii/S2238785421011297Laser weldingCircular oscillationNumerical simulationMolten pool flowKeyhole evolutionGrain structure |
| spellingShingle | Lin Chen Chunming Wang Gaoyang Mi Xiong Zhang Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding Journal of Materials Research and Technology Laser welding Circular oscillation Numerical simulation Molten pool flow Keyhole evolution Grain structure |
| title | Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding |
| title_full | Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding |
| title_fullStr | Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding |
| title_full_unstemmed | Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding |
| title_short | Effects of laser oscillating frequency on energy distribution, molten pool morphology and grain structure of AA6061/AA5182 aluminum alloys lap welding |
| title_sort | effects of laser oscillating frequency on energy distribution molten pool morphology and grain structure of aa6061 aa5182 aluminum alloys lap welding |
| topic | Laser welding Circular oscillation Numerical simulation Molten pool flow Keyhole evolution Grain structure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785421011297 |
| work_keys_str_mv | AT linchen effectsoflaseroscillatingfrequencyonenergydistributionmoltenpoolmorphologyandgrainstructureofaa6061aa5182aluminumalloyslapwelding AT chunmingwang effectsoflaseroscillatingfrequencyonenergydistributionmoltenpoolmorphologyandgrainstructureofaa6061aa5182aluminumalloyslapwelding AT gaoyangmi effectsoflaseroscillatingfrequencyonenergydistributionmoltenpoolmorphologyandgrainstructureofaa6061aa5182aluminumalloyslapwelding AT xiongzhang effectsoflaseroscillatingfrequencyonenergydistributionmoltenpoolmorphologyandgrainstructureofaa6061aa5182aluminumalloyslapwelding |