The ultrashort pulsed (USP) laser microwelding of sapphire/lnvar36 alloy controlled by the surface roughness of metal was investigated for the first time. The surface roughness (Sa) of Invar alloys gradually decreased from 0.944 to 0.029 μm from the prime surface to grounded and polished surface. However, the joint shear strength first increased and then decreased with the lowered Sa, the maximum shear strength reached 107.87 MPa at the Sa ∼ 0.131 μm. Compared to other surfaces with low Sa, the relatively high surface roughness enhanced the interfacial thermal deposition both spatially and temporally which in turn promoted the diffusion of interface elements and the formation of jagged mechanical interlocking structures. Therefore, the appropriate rough metal surface was beneficial for the enhancement of sapphire/metal dissimilar joints. This report is of great significance in simplifying the surface preparation process in the USP laser microwelding of transparent hard and brittle materials with metals, therefore promoting this technique from lab to industry.
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August 2024
Research Article|
July 26 2024
Effects of surface roughness on the microstructure and mechanical properties of dissimilar sapphire/Invar36 alloy joints made by ultrashort pulsed laser micro-welding
Meng Yang
;
Meng Yang
(Conceptualization, Methodology, Writing – original draft, Writing – review & editing)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
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Qing Jiang;
Qing Jiang
(Formal analysis, Validation)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
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Xiang Zhang;
Xiang Zhang
(Methodology, Software)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
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Ming Wu
;
Ming Wu
(Data curation, Project administration)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
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Tao Zhang
;
Tao Zhang
(Conceptualization, Project administration)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
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Rui Pan;
Rui Pan
(Conceptualization, Investigation)
2
Faculty of Materials and Manufacturing, Beijing University of Technology
, Beijing 100124, China
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Peng Li
;
Peng Li
(Funding acquisition, Resources)
3
Shanghai Radio Equipment Research Institute
, Shanghai 201109, China
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Sumei Wang
;
Sumei Wang
(Investigation, Supervision)
4
Laser Micro/Nano-Fabrication Laboratory, Beijing Institute of Technology
, Beijing 100081, China
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Jin Yang
Jin Yang
a)
(Conceptualization, Funding acquisition, Methodology, Writing – review & editing)
1
School of Materials Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People’s Republic of China
a)Author to whom correspondence should be addressed; electronic mail: jyang@sues.edu.cn
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a)Author to whom correspondence should be addressed; electronic mail: jyang@sues.edu.cn
J. Laser Appl. 36, 032021 (2024)
Article history
Received:
May 14 2024
Accepted:
July 09 2024
Citation
Meng Yang, Qing Jiang, Xiang Zhang, Ming Wu, Tao Zhang, Rui Pan, Peng Li, Sumei Wang, Jin Yang; Effects of surface roughness on the microstructure and mechanical properties of dissimilar sapphire/Invar36 alloy joints made by ultrashort pulsed laser micro-welding. J. Laser Appl. 1 August 2024; 36 (3): 032021. https://doi.org/10.2351/7.0001513
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