Multiscale investigation of microstructure optimization in the arc additive manufacturing and arc welding by self-induced ultrasound

Wang, Daqing; Wang, Yajie; Liu, Weihua; Chen, Hua; Yu, Chun; Lü, Hao

doi:10.1016/j.ijheatmasstransfer.2021.121790

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…In this section, we first focus on the dynamics of the weld pool with the square pulsing current within one thermal circle, and then, the comparison of varying oxygen contents is made to reveal the mechanism of the flow dynamics of the molten pool. As shown in Figure 3a-c, while the input of peak current was 200 A, the electric potential near the cathode was calculated to be −12 V, while the magnetic intensity (magnetic flux density~0.014 T) was much smaller than that in GTAW (magnetic flux density~0.1 T), as mentioned in our previous works [20,21], resulting in a smaller Lorentz force both in the arc plasma (1.5 × 10 5 A/m 2 near the hollow tungsten tip) and molten pool (2.8 × 10 4 A/m 2 at the side of the free surface). The maximum arc pressure was 143 Pa in the middle of the hollow cathode tip, while the maximum pressure in the molten pool reached 3521 Pa in the center of the free surface.…”

Section: Resultssupporting

confidence: 63%

Numerical Analysis of Thermal Flow Dynamics of Arc Plasma and Molten Pool in Hollow Cathode Arc Welding with Oxygen Content

Yang,

Du,

Huang

et al. 2024

Coatings

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The mechanism of the pulsed hollow cathode arc welding (HCAW) process was revealed using a fully coupled model with a hollow cathode. We solved the governing equations with the Marangoni effect to study the dynamic behaviors of a molten pool with a square pulsing current (200~400 A, 900 Hz) and varying O2 content; the dynamics of the arc plasma and the weld pool in the HCAW process were investigated quantitatively. The results show that the intensity of the arc plasma was more significantly weakened by the design of the hollow cathode in HCAW than that in GTAW with a solid hollow cathode. We could obtain a stable molten pool even with a large pulsing current section (200 A–400 A) at higher frequencies. The flow dynamics of the molten pool were mainly dominated by the Marangoni effect with varying oxygen content, and we could promote penetration by increasing O2 content in HCAW.

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Section: Resultssupporting

confidence: 63%

Numerical Analysis of Thermal Flow Dynamics of Arc Plasma and Molten Pool in Hollow Cathode Arc Welding with Oxygen Content

Yang,

Du,

Huang

et al. 2024

Coatings

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“…Wang, D.Q. et al [ 7 ] studied the effectiveness of self-induced ultrasonic control of the microstructure of 316 stainless steel based on MHD. Ji, Y. et al [ 8 ] studied the rate of change in MHD angular rate sensors in a complex environment.…”

Section: Introductionmentioning

confidence: 99%

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Li,

Zhang,

Yang

et al. 2024

Sensors

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The magnetohydrodynamics (MHD) model of the alternating current (AC) arc is complex, so a simplified equivalent heat source (EHS) model can be used to replace the complex model in studying the AC arc’s thermal characteristics and cable fire risk. A 2D axisymmetric AC arc MHD simulation model in the short gap of a copper-core cable is established in this paper. The AC arc voltage and current obtained by the model are consistent with experiments. The AC arc’s heat source distribution obtained by the MHD model is fitted to obtain the heat source function Q of the AC arc. Q is divided into 16 independent segmented heat sources, and a correction matrix is constructed to optimize the segmented heat sources. A neural network and a genetic algorithm give the prediction model and the optimal correction matrix of the segmented heat source. The EHS model optimized by the optimal correction matrix can obtain a minimum temperature error of 5.8/4.4/4.2% with the MHD model in different AC arc peak currents 2/4/6 A. The probability of a cable fire is calculated by using AC arc’s optimized EHS model when different numbers of AC arcs are generated randomly in AC half-waves. The EHS model can replace the complex MHD model to study the thermal characteristics of AC arcs and quickly calculate the probability of a cable fire caused by random AC arcs.

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Effect of Current Mode on Anisotropy of 316L Stainless Steel Wire Arc Additive Manufacturing

Zhao

Long

Niu

et al. 2023

J. of Materi Eng and Perform

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Multiscale investigation of microstructure optimization in the arc additive manufacturing and arc welding by self-induced ultrasound

Cited by 5 publications

References 43 publications

Numerical Analysis of Thermal Flow Dynamics of Arc Plasma and Molten Pool in Hollow Cathode Arc Welding with Oxygen Content

Numerical Analysis of Thermal Flow Dynamics of Arc Plasma and Molten Pool in Hollow Cathode Arc Welding with Oxygen Content

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Effect of Current Mode on Anisotropy of 316L Stainless Steel Wire Arc Additive Manufacturing

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