Microstructure and Mechanical Study on Laser-Arc-Welded Al–Zn–Mg Alloy

Gu, Jiaxing; Yang, Shanglei; Xiong, Qi; Duan, Chenfeng

doi:10.2320/matertrans.mt-m2019178

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…At the same time, serious stress concentration occurs under the action of fatigue cyclic load, which leads to the initiation of microcracks and the failure of the welded structure and greatly reduces the safety and reliability of the welded structure [20,21]. It is worth noting that many studies successfully showed that the porosity in WJ can cause serious stress concentration through the establishment of theoretical models [22][23][24]. However, there is a common drawback in these models.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Fan

Yang

Zhu

et al. 2021

Advances in Materials Science and Engineering

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Laser-MIG hybrid welding of 6061-T6 aluminum alloy was carried out with ER4043 welding wire, and the microstructure and fatigue properties of the joint were studied. The grain size of HAZ is larger than that of base metal (BM) due to the influence of welding heat cycle. Snowflake-like equiaxed grains were found in the upper, middle, and lower parts of the welded joint (WJ). Based on the fatigue test with 1 × 106 cycles, the ultimate fatigue strength of BM and WJ is 101.9 MPa and 54.4 MPa, respectively. There are many pores with different sizes in WJ. The number of pores in the upper and middle parts of WJ is obviously larger than that in the lower part due to the influence of the cooling rate of the weld pool and the escape rate of pores. The porosity type is mainly metallurgical pores with regular morphology, which is mainly due to the bubbles formed by the evaporation of Mg elements and H2O in the oxide film on the BM surface. The fatigue fracture analysis shows that the main cause of fatigue crack is the near-surface pores with 460 μm and 190 μm, respectively. The existence of pores near the surface is equivalent to the formation of a large-scale prefabricated crack, resulting in serious stress concentration. The morphology of the grains around the pores has a great influence on the initiation and propagation of the fatigue microcracks.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Fan

Yang

Zhu

et al. 2021

Advances in Materials Science and Engineering

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“…To overcome the shortcomings of laser welding thick aluminum alloys, researchers suggest using the hybrid laser–MIG welding method, which was developed by Steen and Eboo in 1979 [ 92 ]. Hybrid welding combines the advantages of laser welding and MIG welding, resulting in an improvement in energy utilization, an improvement in keyhole stability and an increase in gap bridging ability [ 48 , 49 ]. Compared to MIG welding, hybrid laser–MIG has a lower heat input under the same penetration, and improves the joint efficiency, as listed in Table 6 .…”

Section: Low-heat-input Weldingmentioning

confidence: 99%

“…Low-heat-input welding: such as laser beam welding (LBW), friction stir welding (FSW), and cold metal transfer (CMT) welding. To improve the mechanical properties of age-hardening aluminum alloy joints welded by the low heat input technique, researchers have focused on how to eliminate welding defects [ 41 , 42 , 43 , 44 ], optimize welding parameters [ 45 , 46 , 47 ] and innovate the technique [ 48 , 49 , 50 , 51 , 52 , 53 ].…”

Section: Introductionmentioning

confidence: 99%

Review of Techniques for Improvement of Softening Behavior of Age-Hardening Aluminum Alloy Welded Joints

et al. 2021

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The softening phenomenon of age-hardening aluminum alloy-welded joints is severe during conventional fusion welding, which increases the likelihood of stress and strain concentration in the joint during the period of service, significantly reduces the mechanical properties compared to the base metal, and represents an obstacle to the exploration of the potential structural performance. This review paper focuses on an overview of the softening phenomenon. Firstly, the welding softening mechanism and the characteristics of age-hardening aluminum alloys are clarified. Secondly, the current main research methods that can effectively improve joint softening are summarized into three categories: low-heat-input welding, externally assisted cooling during welding, and post-weld treatment. The strengthening mechanism and performance change rule of age-hardening aluminum alloy joints are systematically analyzed. Finally, this paper considers the future development trends of further research on joint softening, and it is expected that interest in this topic will increase.

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Microstructure and mechanical properties of 6061 aluminum alloy laser-MIG hybrid welding joint

Fan

Yang

Duan

et al. 2022

J. Cent. South Univ.

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Microstructure and Mechanical Study on Laser-Arc-Welded Al–Zn–Mg Alloy

Cited by 9 publications

References 14 publications

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Review of Techniques for Improvement of Softening Behavior of Age-Hardening Aluminum Alloy Welded Joints

Microstructure and mechanical properties of 6061 aluminum alloy laser-MIG hybrid welding joint

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