光束振荡对激光直接焊接钢/CFRP接头能量密度分布及力学性能的影响机理

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-03-26 DOI:10.1016/j.compstruct.2025.119133

Zhaoguo He , Dianwu Zhou , Rui Zhang , Mengying Ye , Congkang Lu , Li Liu , Xinyu Wang , qiao Deng , Jinshui Liu

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引用次数: 0

摘要

采用线性、∞和圆形三种振荡模式对PA66树脂CFRP与DP780双相钢进行直接激光焊接。揭示了梁振荡对接头能量密度分布和性能改善的影响机理。结果表明，接头性能的变化与钢/CFRP界面温度分布密切相关。光束振荡使激光能量密度峰值从中间区域移到条纹区域，减小了中间和条纹之间的界面温差。在线性模式下，条纹和中间区域的激光能量密度均高于∞或圆形模式，并且整个钢/CFRP界面的温度分布均匀，因此由于光束振荡引起的界面温差得到补偿，从而提高了PA66树脂的结晶度和流动性，有利于界面键合。此外，梁的振荡延长了界面的有效加热时间，在钢/CFRP界面形成了高比例的M−C和M−O化学键，因此梁的线性振荡显著提高了钢/CFRP节点的力学性能。

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Influence mechanism of beam oscillation on energy density distribution and mechanical properties of steel/CFRP joint by direct laser welding

Direct laser welding of PA66 resin CFRP to DP780 dual-phase steel using three oscillation modes such as linear,

\infty

, and circular was performed in an overlap steel-on-CFRP configuration. The influence mechanism of beam oscillation on energy density distribution and improvement of joint performance were also revealed. The results suggested that the changes of joint property were closely related to the temperature distribution at steel/CFRP interface. Beam oscillation shifted the peak of laser energy density from the middle to fringe region, decreasing the interface temperature disparity between the middle and fringe. In the case of linear mode, laser energy density at fringe and middle region is both higher than that in

\infty

or circular modes, and the temperature distribution across the whole steel/CFRP interface is uniform, thus the crystallinity and flowability of PA66 resin are increased due to the compensated interface temperature difference caused by the beam oscillation, which is conducive to the interface bonding. Furthermore, the effective heating time of interface is prolonged due to beam oscillation, a high proportion of M−C and M−O chemical bonding are formed at steel/CFRP interface, hence, the mechanical performance of steel/CFRP joint is considerably improved by linear beam oscillation.

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.