Welding characteristics of Al/steel dissimilar metals based on magnetically controlled metallurgy

YAN Fei; ZHOU Yifan; TANG Benkan; XU Yonggang; WANG Chunming

doi:10.12073/j.hjxb.20220101004

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(5): 98-103. > DOI: 10.12073/j.hjxb.20220101004

YAN Fei, ZHOU Yifan, TANG Benkan, XU Yonggang, WANG Chunming. Welding characteristics of Al/steel dissimilar metals based on magnetically controlled metallurgy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(5): 98-103. DOI: 10.12073/j.hjxb.20220101004

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Welding characteristics of Al/steel dissimilar metals based on magnetically controlled metallurgy

1.
Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China
2.
Key Laboratory of Advanced Technologies of Materials, Ministry of Education China, Southwest Jiaotong University, Chengdu, 610031, China
3.
Huazhong University of Science and Technology, Wuhan, 430074, China

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Received Date: December 31, 2021
Available Online: March 29, 2022

Graphical Abstract

Abstract

Abstract

Laser lap deep penetration welding was conducted on Al/steel dissimilar metals with longitudinal alternating magnetic field. Effects of alternating magnetic field on the macro-morphology, microstructure, element distribution, mechanical properties and fracture mode of the joints were carefully investigated using metallographic microscope, scanning electron microscope and other methodologies. The results showed that the weld width decreased and the weld depth increased under applied alternating magnetic field. The electromagnetic force induced by an alternating magnetic field promoted the transformation of resultant IMCs at interface from continuous distribution to discrete distribution. During this process, composition segregation and crack defects were also successfully suppressed. IMCs in interfacial layer may be composed of ζ-FeAl₂, θ-FeAl₃ and β₂-FeAl. Laser welding with applied external magnetic field can improve the loading capacity of the joint. It can attribute to the increase of combined areas and refinement of IMCs structure.
- alternating magnetic field,
- laser welding,
- IMCs,
- mechanical properties,
- crack defects

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References

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Welding characteristics of Al/steel dissimilar metals based on magnetically controlled metallurgy