Heat transfer and melt flow of keyhole, transition and conduction modes in laser beam oscillating welding

被引:69
作者
Ke, Wenchao [1 ,2 ]
Zeng, Zhi [1 ,3 ]
Oliveira, J. P. [4 ]
Peng, Bei [1 ]
Shen, Jiajia [4 ]
Tan, Caiwang [5 ]
Song, Xiaoguo [5 ]
Yan, Wentao [2 ]
机构
[1] Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731, Sichuan, Peoples R China
[2] Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore
[3] UESTC Guangdong, Inst Elect & Informat Engn, Dongguan 523808, Peoples R China
[4] Univ NOVA Lisboa, NOVA Sch Sci & Technol, Dept Mat Sci, CENIMAT I3N, P-2829516 Caparica, Portugal
[5] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
基金
中国国家自然科学基金;
关键词
Laser welding; Beam oscillation; Melting modes; Molten pool dynamics; Keyhole behavior; Energy absorption; 2219; ALUMINUM-ALLOY; POROSITY FORMATION; MECHANICAL-PROPERTIES; MICROSTRUCTURE; DYNAMICS; ABSORPTION;
D O I
10.1016/j.ijheatmasstransfer.2022.123821
中图分类号
O414.1 [热力学];
学科分类号
摘要
Melting modes have significant effects on the heat transfer and fluid flow in laser beam oscillating welding (LBOW), which in turn affects the welding quality and solidification microstructure. In this paper, a computational fluid dynamics (CFD) model for LBOW of 2219 aluminum alloy is developed to study the melting/solidification, fluid flow pattern, keyhole dynamics and energy absorption under different welding modes: keyhole, transition and conduction mode. A hybrid heat source model is developed to describe the influence of the vapor heat and multiple reflections of the laser rays on the keyhole surface. The predicted molten pool dimensions and weld profiles are in good agreement with the experimental results. By increasing the oscillating frequency, the line energy density significantly decreases due to a higher scanning speed that results in a shallower keyhole with wider opening. The laser rays are more likely to leak out after 2-3 reflections which reduces the energy absorption. Thus, the melting mode will transfer from keyhole to conduction mode. With further increase of the oscillating frequency, the heat transfer will be dominated by heat conduction when the energy density is below the threshold for keyhole formation. Our work lay the foundations for optimizing the LBOW process to obtain sound joints. (c) 2022 Elsevier Ltd. All rights reserved.
引用
收藏
页数:13
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