Elucidation of high-power disk laser welding phenomena by simultaneously observing both top and bottom of weldment

Chen, Ziqin; Gao, Xiangdong; Katayama, Seiji; Zhenlin, Xiao; Chen, Xiaohui

doi:10.1007/s00170-016-8837-4

Cited by 12 publications

(2 citation statements)

References 25 publications

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“…Overall, little has been studied on material evaporation during powder bed usion. Nevertheless, studies conducted on laser welding shows that evaporation in luences laser absorption, which in turn gives rise to umes that were deposited on the component as oxygenenriched laser spatter [117,118]. This shows that urther optimisation o the chamber environment is required to reduce oxygen contamination.…”

Section: Chemica Composition and Morpho Ogymentioning

confidence: 99%

Mechanical performance of additively manufactured pure silver antibacterial bone scaffolds

Arjunan

Robinson

Al-Ani

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Implant in ection is a serious complication resulting in pain, mortality, prolonged recovery, and antimicrobial resistance (AMR). Reducing the risk-o -in ection associated with tissue implants require imminent attention, where pure silver (Ag) o ers enormous potential. However, the printability, mechanical per ormance nor microbial resistance o additively manu actured (AM) pure Ag is unavailable in literature. This is critical as Ag is thought to play a vital role in the development o AM patient-speci ic in ection resistant implants in the decade to come. The study there ore additively manu actured 99.9% pure-Ag through selective laser melting (SLM) and systematically investigates its mechanical per ormance. The validated SLM process parameters were then used to conceive two ully porous bone sca old each at approximately 68 and 90% (wt.) porosity. While the study brings to attention the potential de ects in SLM pure-Ag through X-ray nanotomography (Xray nCT), the mechanical properties o porous Ag sca olds were ound to be similar to cancellous bone. The study achieved the highest SLM pure-Ag density o 97% with Young's modulus (E), elastic limit ( ), yield strength ( ), ultimate strength ) and ultimate strain ) in the range o 15. MPa and 0.07-0.10 respectively. The antimicrobial e icacy o printed silver was tested against the common implant in ection-causing Staphylococcus aureus and led to 90% and 99.9% kill in 4 and 14 hours respectively.The study, there ore, is a irst step towards achieving a new generation Ag-based AM in ection resistant porous implants.

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Section: Chemica Composition and Morpho Ogymentioning

confidence: 99%

Mechanical performance of additively manufactured pure silver antibacterial bone scaffolds

Arjunan

Robinson

Al-Ani

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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“…Laser welding has been witnessing wide applications [1]- [3] in car manufacturing, aeronautics and astronautics industry, ship-building and high-speed train manufacturing, due to its narrow heat affected zone, small transformation in workpiece, easy application in flexible manufacturing et al Highpower disk laser welding, which is especially fit for welding thick plates, becomes more and more attractive [4]. Some researchers have conducted a lot of studies to investigate the mechanisms and phenomena during high-power disk laser welding with experiments and numerical simulations [5]- [7].…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Welding Status Monitoring Framework for High-Power Disk Laser Welding (December 2018)

et al. 2019

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Welding status determines the post-weld quality and is crucial to high-power disk laser welding. A low-cost monitoring system based on two photodiodes is developed to monitor the real-time welding statuses in this paper. A deep learning architecture based on stacked autoencoder (SAE) is proposed to automatically learn more representative features of welding statuses from the raw signal features captured by the visible light photodiode and the reflected laser light photodiode without any manual operations. The maximum correntropy loss function is applied to improve the learning ability of the proposed SAE method. Furthermore, a genetic algorithm is applied to optimize the key parameters of the proposed SAE method. The proposed SAE is applied to the high-power disk laser welding experiments and shows better performance in welding status monitoring than the standard AE framework and the conventional SVM and BP method. Additional experiments with different welding parameters validate the effectiveness and robustness of our proposed SAE method. INDEX TERMS Autoencoder, genetic algorithm, laser welding, low-cost, welding status.

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Effects of processing parameters on underfill defects in deep penetration laser welding of thick plates

Zhang

Tang

Zhang

et al. 2018

Int J Adv Manuf Technol

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Elucidation of high-power disk laser welding phenomena by simultaneously observing both top and bottom of weldment

Cited by 12 publications

References 25 publications

Mechanical performance of additively manufactured pure silver antibacterial bone scaffolds

Mechanical performance of additively manufactured pure silver antibacterial bone scaffolds

A Low-Cost Welding Status Monitoring Framework for High-Power Disk Laser Welding (December 2018)

Effects of processing parameters on underfill defects in deep penetration laser welding of thick plates

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