Porosity distribution and mechanical response of laser-MIG hybrid butt welded 6082-T6 aluminum alloy joint

Han, Xiaohui; Yang, Zhibin; Ma, Yin; Shi, Chunyuan; Xin, Zhibin

doi:10.1016/j.optlastec.2020.106511

Cited by 52 publications

(20 citation statements)

References 31 publications

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“…The 6061 aluminium alloy, characterised by a high specific strength and excellent weldability 23,24 is selected for the experiments because of its high relevance to manufacturing industries; its chemical composition is listed in Table 1. The dimensions of the welding specimens are 120 mm 3 80 mm 3 2 mm.…”

Section: Materials and Experiments Setupmentioning

confidence: 99%

Process parameter selection for laser welding of aluminium alloy from the perspective of energy effectiveness

Xiong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser welding is an indispensable part of competitive manufacturing, but it has a critical issue with energy consumption. The existing literature is limited to the energy supplied to the laser-material interaction for the material welding, and the welding quality is not well considered for energy saving. To reduce the total energy consumption of laser welding without compromising the welding quality, this study investigates the effects of process parameters including the laser power, welding speed and focus position on the specific energy consumption (SEC), welding quality and related energy effectiveness (EE) of the laser welding of 6061 aluminium alloy. The results reveal that adjusting the laser power to improve the welding quality will inevitably lead to a significant increase in the SEC. Energy can be saved with a relatively stable welding quality by varying the welding speed, and the welding quality can be improved without appreciably increasing the energy consumption by setting the focus position to approximately −0.5 mm. The EE can be enhanced with a higher laser power within a moderate welding speed range at the negative focus position. A case demonstrated that with a reasonable process parameter configuration, an energy savings of 12.45% could be realised for laser welding, while the tensile strength was increased by 4.29%, and the weld bead integrity remained stable (a decrease of 0.11%).

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Section: Materials and Experiments Setupmentioning

confidence: 99%

Process parameter selection for laser welding of aluminium alloy from the perspective of energy effectiveness

Xiong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…When laser welding thick aluminum alloy structures, the keyhole-welding mode requiring a high-power laser source should be adopted to obtain high penetration depths. However, some critical issues usually arise during the welding process: (I) high energy consumption—the energy density (ratio of the laser power to the beam spot area) for iron-based materials in the keyhole-welding mode is approximately 10 6 W/cm 2 , while the value for aluminum alloys is at least 1.5 × 10 6 W/cm 2 and even 2 × 10 6 W/cm 2 , because aluminum alloys possess high laser radiation reflection and thermal conductivity [ 85 , 86 ]; (II) keyhole-induced porosity—the low-viscosity aluminum alloys cause the keyhole to become unstable and easily collapse, resulting in the entrapment of the gas bubbles during the cooling, which dramatically reduces the mechanical properties of the joint [ 87 , 88 ]; (III) low gap bridging ability and high requirement in positioning—laser welding with a high welding speedand a small focusing point [ 89 , 90 , 91 ].…”

Section: Low-heat-input Weldingmentioning

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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“…in their research concluded that fatigue strength was reduced from 113 MPa to 56 MPa when the porosity rate increased from 0% to 8.9%, and the porosity position had little effect on it. The fracture crack initiated in the weld surface when there was no porosity in the joint, and the fracture cracks occurred near the porosity edges when the porosities appeared in the weld seam, particularly near the larger porosity [6].…”

Section: Figurementioning

confidence: 99%

The Influence of Surface Roughness on Laser Beam Welding of Aluminium Alloys

et al. 2021

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A laser beam is the light that is subject to the laws of physics. Surface roughness can cause that the light can be reflected in different angles. Therefore, the surface roughness may influence the amount of light to be reflected so the power of the laser could be lowered. Present paper analyses the influence of different surface roughness on porosity and geometry of weld joint using design of experiment. Surface roughness monitored during the experiment was in the range from Ra 0.8 to Ra 15 achieved and by machining on aluminium-lithium alloy AW2099. In order to keep the same condition for welding the bead on plate welds were realised. Porosity was analysed using computer tomography. Surface roughness proved to have minor influence on porosity as well as the shape of the weld joint.

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Porosity distribution and mechanical response of laser-MIG hybrid butt welded 6082-T6 aluminum alloy joint

Cited by 52 publications

References 31 publications

Process parameter selection for laser welding of aluminium alloy from the perspective of energy effectiveness

Process parameter selection for laser welding of aluminium alloy from the perspective of energy effectiveness

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

The Influence of Surface Roughness on Laser Beam Welding of Aluminium Alloys

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