Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding
The laser penetration welding for medium-thickness plates struggles with unstable molten pool behavior and a limited processing window, often leading to welding defects including spatters, depressions, and especially humps. In this study, forming processes of the defects were observed by using a hig...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542302985X |
| _version_ | 1827345999590326272 |
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| author | Peikang Tao Chunming Wang Gaoyang Mi Yu Huang Xiong Zhang |
| author_facet | Peikang Tao Chunming Wang Gaoyang Mi Yu Huang Xiong Zhang |
| author_sort | Peikang Tao |
| collection | DOAJ |
| description | The laser penetration welding for medium-thickness plates struggles with unstable molten pool behavior and a limited processing window, often leading to welding defects including spatters, depressions, and especially humps. In this study, forming processes of the defects were observed by using a high-speed camera, and forming mechanism of the defects were then analyzed in detail by simultaneously considering the influences of force and solidification. It was clear that the mass loss caused by spattering during the heating phase contributed to the depression, which was consistent with the existing knowledge. However, the formation mechanism of humps concluded in this study was different to the present understanding. Apart from the influences of force, the effects of solidification on molten pools and humps were analyzed. Under the specific conditions, middle part of molten pool solidified rapidly, causing localized necking, and disrupting the circular flow of the molten metal. As a result, molten metal once flowed downward due to the gravity and temperature can no longer refill to the upper part again, leading to the accumulation of molten metal at lower part and ultimately the formation of humps. These findings offered a fresh perspective on the formation of hump, provided valuable guidance for enhancing the quality and efficiency of thick-plate laser welding. |
| first_indexed | 2024-03-07T23:21:49Z |
| format | Article |
| id | doaj.art-6b3c7eceae714722aedd3f02c4f740bc |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:21:49Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-6b3c7eceae714722aedd3f02c4f740bc2024-02-21T05:28:30ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012775627569Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration weldingPeikang Tao0Chunming Wang1Gaoyang Mi2Yu Huang3Xiong Zhang4State Key Laboratory of Digital Manufacturing Equipment & Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, ChinaState Key Laboratory of Digital Manufacturing Equipment & Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; State Key Laboratory of Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region of China; Corresponding author. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.The laser penetration welding for medium-thickness plates struggles with unstable molten pool behavior and a limited processing window, often leading to welding defects including spatters, depressions, and especially humps. In this study, forming processes of the defects were observed by using a high-speed camera, and forming mechanism of the defects were then analyzed in detail by simultaneously considering the influences of force and solidification. It was clear that the mass loss caused by spattering during the heating phase contributed to the depression, which was consistent with the existing knowledge. However, the formation mechanism of humps concluded in this study was different to the present understanding. Apart from the influences of force, the effects of solidification on molten pools and humps were analyzed. Under the specific conditions, middle part of molten pool solidified rapidly, causing localized necking, and disrupting the circular flow of the molten metal. As a result, molten metal once flowed downward due to the gravity and temperature can no longer refill to the upper part again, leading to the accumulation of molten metal at lower part and ultimately the formation of humps. These findings offered a fresh perspective on the formation of hump, provided valuable guidance for enhancing the quality and efficiency of thick-plate laser welding.http://www.sciencedirect.com/science/article/pii/S223878542302985XHigh power laserPenetration weldingMolten metal flow dynamicsHumps |
| spellingShingle | Peikang Tao Chunming Wang Gaoyang Mi Yu Huang Xiong Zhang Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding Journal of Materials Research and Technology High power laser Penetration welding Molten metal flow dynamics Humps |
| title | Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding |
| title_full | Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding |
| title_fullStr | Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding |
| title_full_unstemmed | Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding |
| title_short | Effects of solidification on flow dynamics: A novel comprehension of defects formation in laser penetration welding |
| title_sort | effects of solidification on flow dynamics a novel comprehension of defects formation in laser penetration welding |
| topic | High power laser Penetration welding Molten metal flow dynamics Humps |
| url | http://www.sciencedirect.com/science/article/pii/S223878542302985X |
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