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Volume 15
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10.3390/ma15072367
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Article

Study of Microstructure and Fatigue in Aluminum/Steel Butt Joints Made by CMT Fusion-Brazing Technology

by
Yu Fang
,
Shanglei Yang
*,
Yubao Huang
and
Xuan Meng
Department of Material Processing Engineering, School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
*
Author to whom correspondence should be addressed.
Materials 2022, 15(7), 2367; https://doi.org/10.3390/ma15072367
Submission received: 25 February 2022 / Revised: 9 March 2022 / Accepted: 16 March 2022 / Published: 23 March 2022
(This article belongs to the Topic Metallurgical and Materials Engineering)
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Abstract

Cold metal transfer (CMT) fusion brazing technology was used to weld 6061 aluminum alloy and Q235 galvanized steel with ER4043 welding wire. The microstructure, hardness, tensile performance, and fatigue performance of the welded joint were observed and analyzed. The results show that the tensile strength of the welded joint is 110.83 MPa and the fatigue strength limit is 170 MPa. In the fatigue process, the coupon first undergoes cyclic hardening and then cyclic softening and a ratchet effect occurs. The coupon was broken at the interface layer or weld zone where the fatigue strength limit is the lowest. The fatigue crack initiation is mainly caused by: (1) inclusions and second-phase particles; and (2) porosity and incomplete fusion. When cracks encounter holes during expansion, the expansion direction will change. The fatigued coupon displays a toughness fracture in the instantaneous fracture zone.
Keywords: cold metal transfer; aluminum/steel butt joint; microstructure; fatigue cold metal transfer; aluminum/steel butt joint; microstructure; fatigue

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MDPI and ACS Style

Fang, Y.; Yang, S.; Huang, Y.; Meng, X. Study of Microstructure and Fatigue in Aluminum/Steel Butt Joints Made by CMT Fusion-Brazing Technology. Materials 2022, 15, 2367. https://doi.org/10.3390/ma15072367

AMA Style

Fang Y, Yang S, Huang Y, Meng X. Study of Microstructure and Fatigue in Aluminum/Steel Butt Joints Made by CMT Fusion-Brazing Technology. Materials. 2022; 15(7):2367. https://doi.org/10.3390/ma15072367

Chicago/Turabian Style

Fang, Yu, Shanglei Yang, Yubao Huang, and Xuan Meng. 2022. "Study of Microstructure and Fatigue in Aluminum/Steel Butt Joints Made by CMT Fusion-Brazing Technology" Materials 15, no. 7: 2367. https://doi.org/10.3390/ma15072367

APA Style

Fang, Y., Yang, S., Huang, Y., & Meng, X. (2022). Study of Microstructure and Fatigue in Aluminum/Steel Butt Joints Made by CMT Fusion-Brazing Technology. Materials, 15(7), 2367. https://doi.org/10.3390/ma15072367

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