Joint formation mechanism and performance of resistance butt spot welding for AA 5754 aluminum alloy sheet

Bi, Yuanbo; Luo, Zhen; Guo, Jing; Yang, Yanqi; Su, Jie; Zhang, Yixuan

doi:10.1016/j.matlet.2022.132279

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Spot welding is widely used in the automotive industry and has been used for many years, but it requires quality control at the manufacturing stage as there may be around 6000 spot welds on a vehicle body [8,9]. The spot welding method is not only used for joining steel components of vehicle bodies, but also allows joining element produced by additive manufacturing technology [10] with aluminum [3,11,12], which makes the technique promising in future construction development.…”

Section: Introductionmentioning

confidence: 99%

Inspection of Spot Welded Joints with the Use of the Ultrasonic Surface Wave

Ulbrich,

Psuj,

Wypych

et al. 2023

Materials

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Spot welded joints play a crucial role in the construction of modern automobiles, serving as a vital method for enhancing the structural integrity, strength, and durability of the vehicle body. Taking into account spot welding process in automotive bodies, numerous defects can arise, such as insufficient weld nugget diameter. It may have evident influence on vehicle operation or even contribute to accidents on the road. Hence, there is a need for non-invasive methods that allow to assess the quality of the spot welds without compromising their structural integrity and characteristics. Thus, this study describes a novel method for assessing spot welded joints using ultrasound technology. The usage of ultrasonic surface waves is the main component of the proposed advancement. The study employed ultrasonic transducers operating at a frequency of 10 MHz and a specially designed setup for testing various spot welded samples. The parameters of the spot welding procedure and the size of the weld nugget caused differences in the ultrasonic surface waveforms that were recorded during experiments. One of the indicators of weld quality was the amplitude of the ultrasonic pulse. For low quality spot welds, the amplitude amounted to around 25% of the maximum value when using single-sided transducers. Conversely, for high-quality welds an amplitude of 90% was achieved. Depending on the size of the weld nugget, a larger or smaller amount of wave energy is transferred, which results in a smaller or larger amplitude of the ultrasonic pulse. Comparable results were obtained when employing transducers on both sides of the tested joint, as an amplitude ranging from 13% for inferior welds to 97% for superior ones was observed. This research confirmed the feasibility of employing surface waves to assess the diameter of the weld nugget accurately.

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Section: Introductionmentioning

confidence: 99%

Inspection of Spot Welded Joints with the Use of the Ultrasonic Surface Wave

Ulbrich,

Psuj,

Wypych

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Nowadays, with energy-saving and emission-reduction demands, the selection of lightweight and high-strength aluminum sheets is becoming a tendency in the auto industry. 5xxx and 6xxx aluminum alloy sheets are widely employed in the inner or outer door panels and aluminum body sheets (ABS) [5][6][7]. However, new types of aluminum sheets are badly needed besides the current aluminum sheets due to application demands for other steel replacements.…”

Section: Introductionmentioning

confidence: 99%

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

Wu¹,

Kai²,

Guan³

et al. 2023

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In this work, slabs of 7085 aluminum alloy were fabricated by electromagnetic stirring and solidifying with copper mold and suffered hot plastic deformation. The straight hot rolling process was used when the slabs were preheated to 420 • C for 1 h. The thicknesses of 1-, 2-, and 3-mm sheets correspond to the thickness reduction rate of 92, 83, and 75 % of original rectangular slabs. The microstructure results show that hot rolling deformation crushes the remanent phases into small sizes, leads particles into homogeneous distribution, and changes the dendritic grain into a fiber structure. The recrystallization rate decreases with the final sheet thickness increase after heat treatment. The recrystallization is strictly restricted when the thickness reduction rate approaches 92 %. EBSD results provide a unique perspective to view grain and dislocation evolution and texture change in different tempers of sheets. The hardness and intergranular corrosion (IGC) performance show that hardness is reduced while the corrosion depth is aggravated by the rise of sheet thickness. The maximum hardness is 86.75 HRB, and the minimum corrosion depth is only 9.17 µm in the 1-mm sheet. The effects of grain boundary precipitates (GBPs), recrystallization, and precipitate-free zone (PFZ) on hardness and IGC were studied.

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Formation mechanism of the quasicrystal in Al-Cu-Mg-Zn aluminum alloy resistance spot weld

Han

Yuan

et al. 2023

Materials Letters

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Joint formation mechanism and performance of resistance butt spot welding for AA 5754 aluminum alloy sheet

Cited by 4 publications

References 12 publications

Inspection of Spot Welded Joints with the Use of the Ultrasonic Surface Wave

Inspection of Spot Welded Joints with the Use of the Ultrasonic Surface Wave

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

Formation mechanism of the quasicrystal in Al-Cu-Mg-Zn aluminum alloy resistance spot weld

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