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Relevant bibliographies by topics / Laser keyhole

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Journal articles
Dissertations / Theses
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Academic literature on the topic 'Laser keyhole'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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Journal articles on the topic "Laser keyhole"

1

Xing, Yucheng, Feiyun Wang, Yong Zhao, Juan Fu, Zhenbang Sun, and Daxing Zhang. "Investigation of the Inhibition Mechanism of Process Porosity in Laser-MIG Hybrid-Welded Joints for an Aluminum Alloy." Coatings 14, no. 11 (2024): 1376. http://dx.doi.org/10.3390/coatings14111376.

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In this paper, 4 mm thick 7075 aluminum alloy was utilized for conducting laser-MIG hybrid welding tests to investigate the correlation between the dynamic behavior of keyholes and process-induced porosity. Additionally, the generation and inhibition mechanisms of process porosity were elucidated. Utilizing a high-speed camera test system of our own design, the formation position and movement characteristics of keyholes in the molten pool under different welding parameters were captured using a “sandwich” method. The dynamic behavior of keyholes during the hybrid welding process was analyzed,

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2

Cunningham, Ross, Cang Zhao, Niranjan Parab, et al. "Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging." Science 363, no. 6429 (2019): 849–52. http://dx.doi.org/10.1126/science.aav4687.

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We used ultrahigh-speed synchrotron x-ray imaging to quantify the phenomenon of vapor depressions (also known as keyholes) during laser melting of metals as practiced in additive manufacturing. Although expected from welding and inferred from postmortem cross sections of fusion zones, the direct visualization of the keyhole morphology and dynamics with high-energy x-rays shows that (i) keyholes are present across the range of power and scanning velocity used in laser powder bed fusion; (ii) there is a well-defined threshold from conduction mode to keyhole based on laser power density; and (iii

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Al-Aloosi, Raghad Ahmed, Zainab Abdul-Kareem Farhan, and Ahmad H. Sabry. "Remote laser welding simulation for aluminium alloy manufacturing using computational fluid dynamics model." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 3 (2022): 1533. http://dx.doi.org/10.11591/ijeecs.v27.i3.pp1533-1541.

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The process of remote laser welding is simulated in this study to identify the keyhole-induced porosity generation mechanisms and keyhole. Three processes are simulated and discussed: laser power levels, laser-beam shaping configurations, and laser keyhole process. The simulation finding reveals that pore development is caused by strong melt flow behind the keyhole. As verification, the equivalent experimental test is also carried out. According to the findings, a welding speed with a high level helps to keep the keyholes released and prevents the flow of strong melt; a big advanced leaning-an

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Al-Aloosi, Raghad Ahmed, Zainab Abdul-Kareem Farhan, and Ahmad H. Sabry. "Remote laser welding simulation for aluminium alloy manufacturing using computational fluid dynamics model." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 3 (2022): 1533–41. https://doi.org/10.11591/ijeecs.v27.i3.pp1533-1541.

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The process of remote laser welding is simulated in this study to identify the keyhole-induced porosity generation mechanisms and keyhole. Three processes are simulated and discussed: laser power levels, laser-beam shaping configurations, and laser keyhole process. The simulation finding reveals that pore development is caused by strong melt flow behind the keyhole. As verification, the equivalent experimental test is also carried out. According to the findings, a welding speed with a high level helps to keep the keyholes released and prevents the flow of strong melt; a big advanced leaning-an

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Fabbro, Remy. "Depth Dependence and Keyhole Stability at Threshold, for Different Laser Welding Regimes." Applied Sciences 10, no. 4 (2020): 1487. http://dx.doi.org/10.3390/app10041487.

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Depending of the laser operating parameters, several characteristic regimes of laser welding can be observed. At low welding speeds, the aspect ratio of the keyhole can be rather large with a rather vertical cylindrical shape, whereas at high welding speeds, low aspect ratios result, where only the keyhole front is mainly irradiated. For these different regimes, the dependence of the keyhole (KH) depth or the keyhole threshold, as a function of the operating parameters and material properties, is derived and their resulting scaling laws are surprisingly very similar. This approach allows us to

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Zhao, Cang, Niranjan D. Parab, Xuxiao Li, et al. "Critical instability at moving keyhole tip generates porosity in laser melting." Science 370, no. 6520 (2020): 1080–86. http://dx.doi.org/10.1126/science.abd1587.

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Laser powder bed fusion is a dominant metal 3D printing technology. However, porosity defects remain a challenge for fatigue-sensitive applications. Some porosity is associated with deep and narrow vapor depressions called keyholes, which occur under high-power, low–scan speed laser melting conditions. High-speed x-ray imaging enables operando observation of the detailed formation process of pores in Ti-6Al-4V caused by a critical instability at the keyhole tip. We found that the boundary of the keyhole porosity regime in power-velocity space is sharp and smooth, varying only slightly between

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Ur Rehman, Asif, Muhammad Arif Mahmood, Fatih Pitir, Metin Uymaz Salamci, Andrei C. Popescu, and Ion N. Mihailescu. "Keyhole Formation by Laser Drilling in Laser Powder Bed Fusion of Ti6Al4V Biomedical Alloy: Mesoscopic Computational Fluid Dynamics Simulation versus Mathematical Modelling Using Empirical Validation." Nanomaterials 11, no. 12 (2021): 3284. http://dx.doi.org/10.3390/nano11123284.

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In the laser powder bed fusion (LPBF) process, the operating conditions are essential in determining laser-induced keyhole regimes based on the thermal distribution. These regimes, classified into shallow and deep keyholes, control the probability and defects formation intensity in the LPBF process. To study and control the keyhole in the LPBF process, mathematical and computational fluid dynamics (CFD) models are presented. For CFD, the volume of fluid method with the discrete element modeling technique was used, while a mathematical model was developed by including the laser beam absorption

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Dong, William, Jason Lian, Chengpo Yan, et al. "Deep-Learning-Based Segmentation of Keyhole in In-Situ X-ray Imaging of Laser Powder Bed Fusion." Materials 17, no. 2 (2024): 510. http://dx.doi.org/10.3390/ma17020510.

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In laser powder bed fusion processes, keyholes are the gaseous cavities formed where laser interacts with metal, and their morphologies play an important role in defect formation and the final product quality. The in-situ X-ray imaging technique can monitor the keyhole dynamics from the side and capture keyhole shapes in the X-ray image stream. Keyhole shapes in X-ray images are then often labeled by humans for analysis, which increasingly involves attempting to correlate keyhole shapes with defects using machine learning. However, such labeling is tedious, time-consuming, error-prone, and can

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Jin, Xiangzhong, Yuanyong Cheng, Licheng Zeng, Yufeng Zou, and Honggui Zhang. "Multiple Reflections and Fresnel Absorption of Gaussian Laser Beam in an Actual 3D Keyhole during Deep-Penetration Laser Welding." International Journal of Optics 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/361818.

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In deep penetration laser welding, a keyhole is formed in the material. Based on an experimentally obtained bending keyhole from low- and medium-speed laser penetration welding of glass, the keyhole profiles in both the symmetric plane are determined by polynomial fitting. Then, a 3D bending keyhole is reconstructed under the assumption of circular cross-section of the keyhole at each keyhole depth. In this paper, the behavior of focused Gaussian laser beam in the keyhole is analyzed by tracing a ray of light using Gaussian optics theory, the Fresnel absorption and multiple reflections in the

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Lai, Wai Jun, Supriyo Ganguly, and Wojciech Suder. "Study of the effect of inter-pass temperature on weld overlap start-stop defects and mitigation by application of laser defocusing." International Journal of Advanced Manufacturing Technology 114, no. 1-2 (2021): 117–30. http://dx.doi.org/10.1007/s00170-021-06851-8.

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AbstractLaser keyhole initiation and termination-related defects, such as cracking and keyhole cavities due to keyhole collapse, are a well-known issue in laser keyhole welding of thick section steels. In longitudinal welding, run-on and run-off plates are used to avoid this problem. However, such an approach is not applicable in circumferential welding where start/stop defects remain within the workpiece. These issues can hinder industry from applying laser keyhole welding for circumferential welding applications. In this paper, the effect of inter-pass temperature on laser keyhole initiation

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Dissertations / Theses on the topic "Laser keyhole"

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Holbert, Roy Kyle. "An investigation of the keyhole penetration mode in carbon dioxide laser welding /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487849377292756.

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Blackburn, Jonathan. "Understanding porosity formation and prevention when welding titanium alloys with 1μm wavelength laser beams". Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/understanding-porosity-formation-and-prevention-when-welding-titanium-alloys-with-1-micro-metre-wavelength-laser-beams(d8708b46-50ac-42f1-8f5e-a26ebdfc8ae6).html.

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Keyhole laser welding is a joining technology characterised by the high focussed power density applied to the workpiece, facilitating deep penetration at high processing speeds. High aspect-ratio welds produced using this process invariably have narrow heat-affected-zones and minimal thermal distortion compared with traditional arc welding processes. Furthermore, the ability to process out of vacuum and the easy robotic manipulation of fibre optically delivered 1μm wavelength laser beams, allow keyhole laser welding to process geometrically complex components. The widespread uptake of keyhole

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Ros, García Adrián, and Silva Luis Bujalance. "Laser welding for battery cells of hybrid vehicles." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17588.

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The report is an overview article, as a result of our investigation at the field of laser welding applied to electromobility cells manufactured in an aluminium housing. This project was proposed by the University of Skövde in collaboration with ASSAR Centre. The key results presented are based on the study of the following parameters: laser type and power, shielding gases, welding modes, patterns and layout. The conclusions of the project define the final selection of each parameter in order to achieve minimum defects and optimal electrical performance by minimizing the contact resistance.

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Folchitto, Edoardo. "Saldatura laser di componenti in rame per la produzione di motori elettrici nel settore automotive." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Il settore automotive ha visto un repentino sviluppo di auto con motori elettrici, date le sempre più stringenti leggi sulle emissioni inquinanti: risulta quindi indispensabile sviluppare nuove architetture per migliorare le prestazioni dei motori elettrici. Gli avvolgimenti tradizionali vengono sostituiti da nuovi avvolgimenti chiamati “hairpin”, realizzati in rame, in grado di essere attraversati da elevati flussi di corrente che consentono di erogare una potenza nettamente maggiore. Il rame è un materiale che gode di ottime proprietà di duttilità, conducibilità elettrica e termica; quest’ul

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Tirand, Guillaume. "Etude des conditions de soudage laser d'alliages à base aluminium par voie expérimentale et à l'aide d'une simulation numérique." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14482/document.

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Le développement du soudage laser dans divers secteurs industriels particulièrement dans l’aéronautique au cours de la dernière décennie, a nécessité bien des études encore insuffisantes en nombre pour bien comprendre et contrôler les conditions de soudage laser que ce soit au niveau interaction laser/matière, au niveau des transferts thermiques ou au niveau métallurgique. La démarche suivie dans cette étude consiste (1) à mettre en évidence expérimentalement la problématique du soudage laser d’alliage base aluminium, c'est-à-dire le couplage des effets entre les différents paramètres de souda

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Zajíc, Jiří. "Porovnání vlastností tupých svarů svařených laserem a plazmou pro austenitickou a feritickou korozivzdornou ocel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382469.

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The thesis is focused on evaluation and comparison of welds made by welding technologies using laser and plasma. For the purpose of comparing those technologies, were chosen austenitic stainless steel x5CrNi18-18 and ferritic stainless steel X6Cr17. These materials were chosen for their diversity in properties gained by high temperatures that go along with most welding processes. First part of the thesis is focused on description of welded materials and technologies of laser and plasma welding. In following experimental section, the thesis is focused on evaluation of welded samples, made for t

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Heiderscheit, Timothy Donald. "Comparative study of near-infrared pulsed laser machining of carbon fiber reinforced plastics." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5946.

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Carbon fiber-reinforced plastics (CFRPs) have gained widespread popularity as a lightweight, high-strength alternative to traditional materials. The unique anisotropic properties of CFRP make processing difficult, especially using conventional methods. This study investigates laser cutting by ablation as an alternative by comparing two near-infrared laser systems to a typical mechanical machining process. This research has potential applications in the automotive and aerospace industries, where CFRPs are particularly desirable for weight savings and fuel efficiency. First, a CNC mill was used

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Métais, Alexandre. "Simulation numérique des phénomènes thermohydrauliques et de diffusion des éléments chimiques lors du soudage laser d'aciers de nature différente." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK052/document.

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La formulation de nouvelles nuances d’aciers présentant des caractéristiques mécaniques équivalentes pour des épaisseurs moindres et la plus-value associée à la possibilité d'assembler deux nuances différentes, nécessitent le développement et la maîtrise des procédés d’assemblage. Grâce à sa haute précision et à sa flexibilité, le procédé de soudage par laser est devenu une des principales techniques pour le raboutage des flans d'aciers de nature différente. La prédiction de la composition chimique locale de la zone fondue formée entre deux aciers en fonction des paramètres de soudage est de g

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Křivan, Miloš. "Simulace geometrie key hole v závislosti na svařovacích parametrech při laserovém penetračním svařování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230461.

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The diploma thesis is focused on simulation of keyhole creation in laser deep penetration welding and on the effect of welding parameters on the geometry of keyhole (weld). With reference to this issue theories of keyhole creation are described. 2D simulation model that is created in mathematical software Matlab is verified pursuant welding results of non-alloy constructional steel 1. 0122 and stainless steel 1.4301. Effect of welding parameters on the geometry of keyhole and on the quality of weld is investigated through the welds in non-alloy steel 1.0122.

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Mostafa, Massaud. "Etude du perçage et du soudage laser : dynamique du capillaire." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00692412.

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L'objectif de ce travail est d'étudier expérimentalement la formation du capillaire durant le perçage et le soudage par faisceau laser, et de développer une simulation numérique permettant de reproduire la dynamique de formation et d'évolution du capillaire. Nous avons fait le choix d'utiliser comme matériau test le Zinc, en raison de ses propriétés thermodynamiques. Afin de simplifier le problème, nous avons étudié dans un premier temps le mécanisme de perçage. Deux méthodes expérimentales ont été utilisées pour caractériser l'évolution de la géométrie du capillaire : La méthode DODO (Direct

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Book chapters on the topic "Laser keyhole"

1

Dowden, John. "Laser Keyhole Welding: The Vapour Phase." In The Theory of Laser Materials Processing. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56711-2_5.

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Dowden, John Michael. "Simple Models of Laser Keyhole Welding." In The Mathematics of Thermal Modeling, 2nd ed. CRC Press, 2024. http://dx.doi.org/10.1201/9781032684758-6.

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Dowden, John. "Laser Keyhole Welding: The Vapour Phase." In The Theory of Laser Materials Processing. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9340-1_4.

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Kaplan, Alexander. "Keyhole Welding: The Solid and Liquid Phases." In The Theory of Laser Materials Processing. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56711-2_4.

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Kaplan, Alexander. "Keyhole Welding: The Solid and Liquid Phases." In The Theory of Laser Materials Processing. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9340-1_3.

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Gong, Shuili, Shengyong Pang, Hong Wang, and Linjie Zhang. "Simulation of Transient Keyhole and Weld Pool." In Weld Pool Dynamics in Deep Penetration Laser Welding. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0788-2_4.

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Gong, Shuili, Shengyong Pang, Hong Wang, and Linjie Zhang. "Dynamic Behaviors of Metal Vapor/Plasma Plume Inside Transient Keyhole." In Weld Pool Dynamics in Deep Penetration Laser Welding. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0788-2_5.

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Gong, Shuili, Shengyong Pang, Hong Wang, and Linjie Zhang. "Keyhole and Weld Pool Dynamics in Dual-Beam Laser Welding." In Weld Pool Dynamics in Deep Penetration Laser Welding. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0788-2_7.

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Gong, Shuili, Shengyong Pang, Hong Wang, and Linjie Zhang. "Dynamical Behaviors of Keyhole and Weld Pool in Vacuum Laser Welding." In Weld Pool Dynamics in Deep Penetration Laser Welding. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0788-2_9.

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Gong, Shuili, Shengyong Pang, Hong Wang, and Linjie Zhang. "Keyhole and Weld Pool Dynamics in Laser Welding with Filler Wires." In Weld Pool Dynamics in Deep Penetration Laser Welding. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0788-2_8.

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Conference papers on the topic "Laser keyhole"

1

Kaplan, Alexander F. H., Masami Mizutani, Seiji Katayama, and Akira Matsunawa. "Keyhole laser spot welding." In ICALEO® 2002: 21st International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2002. http://dx.doi.org/10.2351/1.5066203.

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Cho, M. H., D. Farson, J. Y. Lee, and C. D. Yoo. "Laser weld keyhole dynamics." In ICALEO® 2001: Proceedings of the Laser Materials Processing Conference and Laser Microfabrication Conference. Laser Institute of America, 2001. http://dx.doi.org/10.2351/1.5059953.

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Zhou, J., H. L. Tsai, P. C. Wang, and R. Menassa. "Melt Flow and Porosity Formation in Pulsed Laser Keyhole Welding." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56732.

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Instead of CW (continuous wave) mode, pulsed mode laser welding has been popularly used in industry especially for Nd: YAG lasers. In pulsed mode laser keyhole welding, pores have been frequently observed near the root of the solidified weld. Our previous studies have indicated that the formation of porosity is caused by two competing mechanisms during the keyhole collapse process, and they are 1) the speed of solidification process for the melt surrounding the keyhole and 2) the speed of melt backfilling the keyhole. If the solidification process is too fast and completed before the keyhole i

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Pang, Shengyong, Liliang Chen, Yajun Yin, et al. "Three-dimensional simulation transient keyhole evolution during laser keyhole welding." In Photonics and Optoelectronics Meetings 2009, edited by Dianyuan Fan, Horst Weber, Xiao Zhu, et al. SPIE, 2009. http://dx.doi.org/10.1117/12.843202.

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Poueyo-Verwaerde, Anne, B. Dabezies, and Remy Fabbro. "Thermal coupling inside the keyhole during welding process." In Europto High Power Lasers and Laser Applications V, edited by Eckhard Beyer, Maichi Cantello, Aldo V. La Rocca, Lucien D. Laude, Flemming O. Olsen, and Gerd Sepold. SPIE, 1994. http://dx.doi.org/10.1117/12.184720.

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Gärtner, Philipp, and Rudolf Weber. "Spatter formation and keyhole observation with high speed cameras - Better understanding of the keyhole formation." In ICALEO® 2009: 28th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2009. http://dx.doi.org/10.2351/1.5061576.

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Metzbower, E. A. "Absorption in the keyhole." In ICALEO® ‘97: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1997. http://dx.doi.org/10.2351/1.5059719.

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Bardin, Fabrice, Adolfo Cobo, Jose M. Lopez-Higuera, et al. "Process control of laser keyhole welding." In ICALEO® 2004: 23rd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2004. http://dx.doi.org/10.2351/1.5060185.

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Matsunawa, Akira, Naoki Seto, Masami Mizutani, and Seiji Katayama. "Liquid motion in keyhole laser welding." In ICALEO® ‘98: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1998. http://dx.doi.org/10.2351/1.5059193.

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Xu, Guoliang, Zhaogu Cheng, Jin'an Xia, Xianqin Li, and Jinbo Jiang. "Laser keyhole welding on aluminum alloys." In Advanced High-Power Lasers and Applications, edited by Xiangli Chen, Tomoo Fujioka, and Akira Matsunawa. SPIE, 2000. http://dx.doi.org/10.1117/12.377081.

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Reports on the topic "Laser keyhole"

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Wood, B. C., T. A. Palmer, and J. W. Elmer. Comparison Between Keyhole Weld Model and Laser Welding Experiments. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/15006362.

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Ahlquist, E., V. Castillo, and Y. Hu. Keyhole-mode Microscopy Dataset for Laser Powder-bed Fusion Modeling. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1878448.

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