Literatura académica sobre el tema "Fabrication additive arc-fil"
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Tesis sobre el tema "Fabrication additive arc-fil"
Cadiou, Stephen. "Modélisation magnéto-thermohydraulique de procédés de fabrication additive arc-fil (WAAM)". Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS544.
Texto completoOne of the obstacles to the development of additive manufacturing processes is the quality of the built parts. Some defects, such as porosity, deformations or cracks, may appear. These defects depend strongly on the choice of operating parameters. Numerical modelling can therefore help to understand how these operating parameters control the final geometry, and the thermal cycles experienced by the material, which impact the microstructure, the deformations and residual stresses of the final part. In this thesis, several numerical models have been developped in order to better understand the final characteristics of the part. The first one concerns a 2D axial-symmetric model of arc to deal with a static TIG process. The Maxwell equations coupled with the mass, momentum, energy equations are solved in the plasma and the melt pool. Using this reference case, the arc model has been validated. This model has been made more complex by adding a level set method to track the gas-liquid interface present in pulsed MIG process in 2D axial-symmetric geometry. This model has been validated through experimental data and then extended to a 3D geometry to simulate the build-up of a wall using a CMT process. This multiphysics model was limited to the scale of the melt pool. A second 3D model was then proposed at the scale of the wall using a purely thermal model to simulate the multi-layer process with geometry prediction
Wang, Zeya. "Robotisation de la fabrication additive par procédé arc-fil : Identification et amélioration de la commande". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0068.
Texto completoAdditive manufacturing of metallic parts has gained significant popularity in recent years as an important technological solution for the production of complex parts. Among the different processes of metal additive manufacturing, the wire-arc additive manufacturing (WAAM) using CMT (Cold metal transfer) welding is taken for our study because of its high deposition rate, low cost of equipment and little loss of material (low spatter) during manufacturing. In the literature review, it can be noted that one of the most important problems that prevent the industrial application of the WAAM is the poor geometric accuracy of the manufactured parts due to the instability of the process and the lack of reliable control system to deal with irregularities during deposition. The focus of this work is to improve the stability and geometric performance of the process. In this work, an experimental system is implemented to robotize the process and to monitor the geometry of the deposited parts. The process is modeled by artificial neural networks and a control system is developed to regulate the geometry of the deposit and to reduce manufacturing errors. Furthermore, an improvement strategy is applied in order to reduce the geometric instabilities at the ends of the bead; an in-situ monitoring method is also developed to detect the internal defects of deposited parts
Querard, Vincent. "Réalisation de pièces aéronautiques de grandes dimensions par fabrication additive WAAM". Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0001/document.
Texto completoIn the field of additive manufacturing (AM), several processes are present and have different applications and levels of development: the main technologies are powder-bed based AM, powder projection and Wire Additive Manufacturing (WAM). We have studied, in this PhD work, the manufacturing of large scale components in aluminum alloy for aircraft industry with Wire Arc Additive Manufacturing (WAAM). This technology is based on a welding generator, a shielding gas protection and a feedstock (wire in this case). To solve this issue, several ways of research were investigated. The first one dealt with toolpath generation: several experiments have highlighted the importance of tool path generation and the tool orientation to manufacture complex parts and improve the part accuracy. The second one was about the validation of the material quality after deposit. Microstructural observations and mechanical tests have demonstrated the effect of process parameters on the deposit quality. Finally, in the context of a DGA/DGAC funded research project, whose partners were STELIA, CT INGENIERIE, CONSTELLIUM and l’Ecole Centrale de Nantes, the manufacturing of functional part in aluminum alloy has shown the interest of the process for aircraft industry. A structural component based on a double curvature geometry has been manufactured with WAAM. The methodologies developed in this PhD work have enabled us to solve the issues to manufacture that type of component
Bercelli, Lorenzo. "Étude des propriétés en fatigue polycyclique des matériaux et des structures obtenus par le procédé de fabrication additive arc-fil". Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0008.
Texto completoAdditive manufacturing processes act as an alternative to the production of complex geometries and high added value parts. It is the case in the naval industry for which the Wire and Arc Additive Manufacturing (WAAM) process is used to fabricate hollow structures. WAAM materials usually show a heterogeneous microstructure, internal defects, a strong residual stress field and rough asbuilt surfaces. The objective of the present work is to propose a method for fatigue life prediction taking into account both the internal defects and the rough asbuilt surfaces. The material parameters of probabilistic models are determined through the use of thermometry in fatigue tests. Firstly, it is shown that the self-heating of machined samples is not affected by the presence of rare pores, allowing for the identification of the fatigue properties of a virtually defect-free WAAM material. Secondly, the use of infrared thermography allows for the detection and the tracking of fatigue cracks on rough as-built surfaces of samples, giving useful information to the modelisation of crack propagation. Finally, these tests results are confronted to the case of a hollow WAAM structures with rough as-built internal surfaces. The fatigue testing of these structures allow to set the basis of a fatigue dimensioning method
Ushakov, Ilia. "Établissement des structures et propriétés mécaniques de l’alliage d’Inconel 625 dans les procédés d’élaboration additive à grande vitesse : arc fil, laser fil, laser poudre et hybride". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0147.
Texto completoThis work focuses on the establishment of microstructures and the characterization of the mechanical properties of Inconel 625 alloy produced as part of the PAM-PROD project aimed at producing large parts using high deposition rate additive manufacturing. Three deposition techniques are being studied: Arc/Wire, Laser/Wire and Laser/Powder, as well as a combination of Laser/Wire and Laser/Powder to produce a hybrid wall. Macrostructures and microstructures are characterized for each process. The Arc/Wire and Laser/Powder processes used lead to a mixed columnar - equiaxed macrostructure. The Laser/Wire process leads to predominantly columnar structures. Mechanisms for the formation of columnar/equiaxed structures and transitions are proposed. These mechanisms are then taken up and completed to interpret the formation of the transition zone in the case of a hybrid Laser Wire/Powder wall. The response to solution heat treatment and ageing is then presented by detailing and comparing the kinetics and mechanisms specific to each process. The tensile mechanical properties along 3 directions are then characterized and related to the structures. For all the processes, a high degree of reproducibility is obtained and none of the processes has a brittle character. The best properties were obtained with the Laser/Powder process, and the hybrid junction test showed that the transition zone was not a weak point in the structure
Belhadj, Mohamed. "Fabrication additive par arc électrique : règles méthodes pour l’élaboration de pièces brutes en vue de leur parachèvement par usinage". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0003.
Texto completoWire Arc Additive Manufacturing is a manufacturing technology that uses metal wire as the raw material and an electric arc as the energy source. The wire is deposited at a predefined rate and fused by the arc, either onto a substrate or onto a pre-existing layer. This research focuses on the use of the Cold Metal Transfer (CMT) process applied to austenitic 316L stainless steel. While this technology is widely and successfully used for repair, the current challenge lies in the mass production of functional parts, requiring the resolution of specific design and manufacturing issues.The first objective of this thesis is to evaluate the impact of process parameters, in particular travel speed and interpass time, on part dimensions, surface quality and machining finish. To accomplish this, a design of experiments was set up, involving the manufacture of multi-layer, multi-bead walls on a substrate mounted on an aluminum support. Next, one face of each fabricated wall was machined to determine the machining depth required to achieve a waviness-free surface, and to analyze the surface roughness and hardness of these areas. Finally, a new overlapping method was developed.The second objective is to use the results obtained to develop methods and rules for moving from 3D design to the production of a final part. These methods rely on an additive manufacturing phase and a machining finishing phase. This process aims to eliminate geometric and surface finish variations inherent to the WAAM process, determine the necessary machining allowance, and incorporate issues related to the primary process.The final objective is to understand the mechanisms behind the generation of residual stresses and deformations induced by the primary process. To achieve this, a thermomechanical modeling of the process was developed, highlighting the influence of Travel speed and interpass time on the thermomechanical behavior
Gomez, Ortega Arturo. "Prototypage rapide de pièces en alliage d’aluminium : étude du dépôt de matière et d’énergie lors de la fusion à l’arc d’un fil par le procédé MIG-CMT". Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS067/document.
Texto completoA new additive manufacturing process for metallic parts, based on the arc welding process known as CMT (Cold Metal Transfer), is studied with the objective of building parts with the aluminium alloy Al5Si. A workbench for additive manufacturing based on the 3D printers open-source principle, on which the CMT generator was integrated, was specially developed. The CMT process allows to control the aluminium wire melting and its deposition under the form of droplets on the building surface, forming, after solidification, beads that can be superposed for the parts construction. The process parameters influence on the material transfer and heat transfer during the metal melting and deposition on the build surface, as well as on the geometric characteristics of the deposed beads, in the case of mono-layer deposits, and in the case of multi-layer walls, is studied. Many geometric defects were observed, and their apparition conditions analysed, thanks in particular to the use of a high-speed camera. The understanding of the relations between the process parameters, the melting and heat transfer mechanisms, and the beads geometry, allowed the defects correction by identifying and modifying the process parameters responsible of their apparition. Finally, an on-line control method for the process, based on the analysis of the voltage and current signals produced by the welding generator during the deposition phenomena, making possible the early detection of defects, and then the modification of the process parameters before they are amplified, has been proposed
Nwankpa, Uzoma Vincent. "Effectiveness of arc based processes and deposition strategies on additive manufacture structure for naval and aerospace applications". Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0010.
Texto completoWire and Arc Additive Manufacturing process is becoming an alternative technique used in manufacturing components of complex structures, which were unimaginable to achieve by conventional manufacturing methods. Various arc-based processes have been applied with titanium, aluminium, steel, and stainless steel to produce large components. Nevertheless, the best arc-based process for any given material of choice is yet to be addressed. In this research, several arc-based processes were investigated for their suitability to manufacture austenitic stainless steel and aluminium structures. However, the latter was confined to be deposited by cold metal transfer process (CMT) due to its high deposition rate and low heat input. Different deposition strategies and the use of gas metal arc, tungsten inert gas and plasma arc as heat sources for the deposition of austenitic stainless steel were investigated. An in-depth investigation of the process parameters such as current, wire feed speed and travel speed were carried out. It was found that the mechanical properties on each structure deposited by various arc-based processes satisfied the required mechanical properties Moreover, deposition strategies had moreimpact on the mechanical properties. Inaddition, the geometry accuracy and ferrite number decrease with respect to increased heat input. Aluminium studies were investigated with CMT process; a methodology to select the best CMT synergy and deposition mode for a prototype wire was proposed. Furthermore, the impact of deposition strategies and alternating these strategies with various CMT modes on mitigating crack propagation from the root of a WAAM component was investigated. Detailed studies on impact of ramping parameters on the aluminium thin wall geometry accuracy were performed. Afterwards the ramping parameters was implemented in the manufacture of suspended aluminium structures on steel support. Finally, the investigation showed that deposition of aluminium structure on a support of dissimilar properties is subject to crack due to uneven thermal expansion and contraction. The results of these research work on austenitic stainless steel and aluminium alloys for WAAM component can be of significance in the naval and aerospace applications
Bourlet, Clément. "Développement de la fabrication additive par procédé arc-fil pour les aciers : caractérisation microstructurale et mécanique des dépôts en nuances ER100 et 316L pour la validation des propriétés d'emploi de pièces industrielles". Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0058.
Texto completoWire-arc additive manufacturing is a new process using a common weldingrobotic cell to build large parts layer by layer. It allows building rough single pieces orsmall series parts with a low cost and a short delay. First developments were done ontitanium and aluminum parts for aeronautic and space applications, but more industriessuch as maritime, oil and gas, railway…are now interested into it. In this work, amethodology is proposed to define suitable process parameters and deposit’s strategies,with the final control of the elaborated parts. Developments are done on both highstrength steel ER100 and austenitic stainless steel 316LSi. The results of theexperimental characterisation enable to show the relations between the manufacturingconditions, the dimensions, the microstructure and the mechanicals properties of theparts, and finally lead to guidelines to evolve the wire-arc additive manufacturingtowards industrialisation