熔池形态对铝-铜激光焊接头组织和性能的影响

doi:10.11896/cldb.20090038

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Abstract T2 copper plate and 2A16 aluminum alloy plate were welded by laser beam welding with fusion mode and fusion brazing mode, the mechanical properties of the joint were analyzed, and the microstructure and interface morphology of the joint were studied. The effect of morphology of molten pool on the microstructure and properties of the joint were described. The results show that the molten pool is obtained by laser fusion welding, when the welding energy Q=1 160 J/cm, the interface layer is composed of Al₄Cu₉+Al₂Cu compound and (α-Al)+(θ-Al₂Cu) eutectic structure with a total thickness of 60.9 μm. The molten pool is obtained by laser welding-braing, when Q=1 466.67 J/cm, the tensile strength of joint is 274.25 MPa, which is 280.9% higher than that of fusion welding joint, the interfacial layer is composed of CuZn₅ and Al₂Cu compounds with a total thickness of 10.23 μm. The thickness of IMC layer is affected by the diffusion coefficient (D_{fusion-welding} > D_{welding-braing)}and annular convection under different molten pool shapes, which determines the performance of the joint.

Key words： form of molten pool laser welding-brazing welding heat input interdiffusion coefficient annular flow

Published: 12 November 2021

CLC number:

TG444+.74

Fund:National Natural Science Foundation of China (51865034).

Corresponding Authors: 70269@nchu.edu.cn

About author:: Chengmin Deng, School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, is a postgraduate student. The main research directions are dissimilar metal meterials, laser welding.
Donghai Cheng, associate professor, Department of Welding Engineering, Nanchang Aviation University, master’s supervisor. From September 2000 to January 2010, he obtained bachelor’s degree in engineering of material forming and control engineering and doctor’s degree in engineering of material processing engineering at Beijing University of Science and Technology. He presided over the National Natural Science Foundation, the Aviation Foundation, the Provincial Department of Education Foundation and several horizontal topics, and published more than 60 academic papers in important journals at home and abroad. Mainly engaged in high-energy beam welding, brazing and other directions of research.

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	DENG Chengmin
	CHENG Donghai
	CHEN Guocai
	LI Dongyang
	LI Wenjie
	CHEN Yiping
	HU De’an

Cite this article:

DENG Chengmin,CHENG Donghai,CHEN Guocai, et al. Effect of Different Molten Pool on Microstructure and Properties of Aluminum-Copper Laser Weld Joint[J]. Materials Reports, 2021, 35(20): 20052-20056.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20090038 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20052

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