Numerical and experimental investigation into effect of temperature field on sensitization of Alloy 690 butt welds fabricated by gas tungsten arc welding and laser beam welding

Lee, Hwa Teng; Chen, Chun‐Te; Wu, Julia

doi:10.1016/j.jmatprotec.2010.05.012

Cited by 31 publications

(9 citation statements)

References 22 publications

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“…3 is introduced and the following nonlinear heat diffusion equation is considered, describing the spatiotemporal variations of the temperature in the welded workpiece [2][3][4] …”

Section: Dynamic Model Of the Arc Welding Processmentioning

confidence: 99%

“…According to welding theory, the temperature of the heat affected zone determines the quality of the weld [2][3][4][5][6]. The heat-affected zone is defined as the area round the weld bead where the temperature of the melted material varies between a lower and upper limit, where each limit is associated with transition to a different phase and structure of the material.…”

mentioning

confidence: 99%

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Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Rigatos

Siano

2016

Intell Ind Syst

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Control of the heat diffusion in the welded metal is of primary importance for successful welding of high quality (the latter being a prerequisite for efficient ship building). The paper proposes a distributed parameter systems control method that is based on differential flatness theory, aiming at solving the problem of heat distribution control in the arcwelding process. Besides it proposes a nonlinear filtering method, under the name Derivative-free nonlinear Kalman Filtering for reducing the number of real-time control measurements needed to implement the feedback control loop. The stability of the control method is confirmed analytically, while its efficiency is also evaluated through simulation experiments.

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“…3 is introduced and the following nonlinear heat diffusion equation is considered, describing the spatiotemporal variations of the temperature in the welded workpiece [2][3][4] …”

Section: Dynamic Model Of the Arc Welding Processmentioning

confidence: 99%

mentioning

confidence: 99%

Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Rigatos

Siano

2016

Intell Ind Syst

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“…Como resultado obtuvo que en general el agua no posee un efecto perjudicial para la unión soldada. Por su parte, Hwa [6] estudia el efecto de la temperatura en uniones soldadas por el proceso TIG, encontrando una alta correlación entre las simulaciones numéricas y las pruebas experimentales. Shi y colaboradores [7] estudian la evolución de la estructura de grano en la ZAC, para un acero de grano fino SS400.…”

Section: Introductionunclassified

Estudio teórico experimental sobre el fenómeno de enfriamiento postsoldadura en una unión soldada cruciforme

Ríos

Peña

2016

Ingeniare. Rev. chil. ing.

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En este trabajo se presenta un estudio sobre el comportamiento del campo de temperatura y del perfil de esfuerzos residuales que aparecen en una unión soldada tipo cruciforme durante la fase de enfriamiento postsoldadura. Se utiliza un modelo 3D y un análisis de transferencia de calor transciente no lineal mediante el método de los elementos finitos. La corroboración de las simulaciones obtenidas se logra experimentalmente construyendo probetas soldadas con geometría cruciforme utilizando el proceso SMAW, empleando como metal base placas en acero estructural ASTM HR A36 y metal de aporte correspondiente a electrodos E6013. Las probetas son sometidas a tres condiciones de enfriamiento: en agua, en aceite, y en aire. Se establece un campo de temperatura inicial definido de acuerdo con los datos termográficos obtenidos por vía experimental en el momento de la construcción de los testigos no estandarizados, los cuales se fabrican con tres tamaños distintos de cateto de soldadura y con un espesor de placa constante. Se encuentra muy buena correspondencia entre las curvas de enfriamiento experimentales y las curvas de enfriamiento de las simulaciones numéricas. Como conclusiones fundamentales se obtiene que tanto el tamaño de la región afectada por los esfuerzos residuales como las magnitudes pico de estos están influenciadas por el medio de enfriamiento; medios de enfriamiento que provocan tasas de enfriamiento altas, generan regiones de esfuerzos residuales, cuyas magnitudes son más altas. Además, se observó un incremento de los esfuerzos residuales para una mayor dimensión del cateto de soldadura. Palabras clave: Unión soldada cruciforme, tasa de enfriamiento, esfuerzo residual, perfil de temperatura.

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“…The time-temperature-transformation (TTT) curve and continuous cooling transformation (CCT) curve can reflect the phase transformation characterization and provide evidence for quenching process. JMATPRO as a powerful software is commonly used in calculating TTT/CCT diagrams and thermo-physical properties [9,10], which is commonly used to investigate properties of carbon steel, the low alloy steels, Cr-Mo steels [11] and multi-component alloys [12] and nickel-based super alloys [13]. It can also be enlarged to investigate high temperature deformation behavior [14], to establish the phase -field model [4] and to simulate the microstructure [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure simulation and mechanical properties of aisi1050 disk during quenching process

Fu¹,

Li²,

Li³

et al. 2016

Proceedings of the 2016 International Conference on Innovative Material Science and Technology (IMST 2016)

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Microstructures of AISI1050 disk after quenching process (cooling from 880°C to 150°C by 6% AQ251 quenchant) were simulated by DEFORM-HT software, and the corresponding mechanical properties were calculated by the finite difference method (FDM). Above all, thermo-physical parameters and diagrams of CCT curve were calculated by JMATPRO software, and then the characterization of phase transformation and CCT curve were fatherly analyzed. Besides, the simulation of multi-phase microstructure considering initial thermo-physical parameters was realized by DEFORM-HT. The FDM method helps to obtain the volume fraction of single phase, and a weight function considering carbon equivalent of phases was introduced to predict the final hardness of multi-phase and quenched microstructure according to the single phase hardness simulated. This helps to explain the relationship between final hardness and various single phases.

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Numerical and experimental investigation into effect of temperature field on sensitization of Alloy 690 butt welds fabricated by gas tungsten arc welding and laser beam welding

Cited by 31 publications

References 22 publications

Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Control of Heat Diffusion in Arc Welding Using Differential Flatness Theory and Nonlinear Kalman Filtering

Estudio teórico experimental sobre el fenómeno de enfriamiento postsoldadura en una unión soldada cruciforme

Microstructure simulation and mechanical properties of aisi1050 disk during quenching process

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