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1
Content available Identification of the heat source and thermal material model parameters for the laser engineered net shaping
Hajder Lucyna, Zhang Tao, Nguyen Vu
Computer Methods in Materials Science
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2022
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Vol. 22, No. 1
43--54
EN
The research’s primary goal is to identify the heat source and thermal material model parameters for the numerical simulation of the laser engineered net shaping (LENS). Inconel 718 was selected as a case study for the current investigation. The LENS process’s numerical model was developed within commercial finite element software and was used as a direct problem model during the parameter identification stage. Experimental data were obtained based on a rectangular-shaped sample with thermocouples located under the based material surface. The recorded thermal profiles were used to establish a goal function for the parameter identification stage. As a result, parameters describing the melt pool geometry during the additive manufacturing, as well as thermal coefficients describing interactions between the sample material and surrounding/base material, were determined.
2
Content available remote Wpływ modeli źródeł ciepła na proces symulacji przetapiania laserowego w środowisku SYSWELD
Poloczek T., Kik T.
Przegląd Spawalnictwa
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2018
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R. 90, nr 5
60--64
PL
W artykule przedstawiono porównanie przetapiania laserowego do symulacji tego procesu wykonanej w środowisku SYSWELD. Zbadano parametry geometryczne uzyskanych przetopień podczas przetapiania laserem dyskowym TruDisk 3302 oraz diodowym ROFIN DL 020, porównując z danymi z procesu symulacji. Przedstawiono zastosowanie różnorodnych modeli źródeł ciepła i ich wpływ na prawidłowość modelowanego procesu. W wyniku analiz uzyskano rozkłady pól temperatur, które następnie porównano z wynikami z rzeczywistych prób.
EN
The article presents a comparison of laser remelting and simulation of this process carried out in the SYSWELD environment. Geometric parameters of obtained remelts were examined, comparing with the data received from the simulation process. The application of various models of heat sources and their influence on the correctness of the modelled process is presented. As a result of the analyzes, the distributions of temperature fields were obtained, which were then compared to the results from actual tests.
3
Content available The influence of the constraint effect on the mechanical properties and weldability of the mismatched weld joints. Part I
Ranatowski E.
Polish Maritime Research
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2012
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nr 1
44-51
EN
The process of welding has dynamic character and is related with the local change of the internal energy E of welded system and can be defined by general dependence between intensive .j and extensive .j parameters. The knowledge of the run of thermo-dynamical process under welding indicates on the possibility of active modelling of weldability and the control of welding process: .j = .E/..j. Hence, these process can be enhanced by mathematical modelling and numerical analysis of weldability models of, i.e. welding processes of material behaviour in welding and the strength of welded structures. The main attention is focused on the assessment of susceptibility of materials under defined welding conditions using fracture mechanics parameters. The analysis is based on the normalised parameters such as: ./.c, KIth/KIC, as a measure of the susceptibility of materials in welding process. The deformation process and fracture parameters calibrations are influenced by constraint; hence the importance of determining the deformation behaviour and fracture parameters as a function of constraint. Furthermore, there established analytically the condition of welding process in mismatched weld joints for strength equal to base metal. Finally, same analytical examples which present new capabilities of weldability estimates and mechanical properties of mismatched weld joints are presented.
4
Content available Mathematical modelling of laser welding in shipbuilding
Ranatowski E., Ciechacki K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
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2010
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nr 24 (96)
80-87
EN
A physical model of laser welding process is presented. At the beginning of this paper a short characteristic of correct modelling procedure is shown. In the further part, the form of heat transport in laser welding is described. Also the cylindrical-involution-normal (C-I-N) heat source (H-S) model and the Fourier - Kirchhoff partial differential equation are made and discussed.
PL
W pracy przedstawiono fizyczny model spawania laserowego. W początkowej części scharakteryzowano proces poprawnego modelowania. W dalszej kolejności opisano formę transportu ciepła w procesie spawania laserowego. Również określono cylindryczno-potęgowo-normalne (C-P-N) źródło ciepła (Z-C) i analityczno-numeryczny proces modelowania i ich zastosowanie w inżynierskiej działalności.
5
Content available Problems of welding in shipbuilding - an analytic-numerical assessment of the thermal cycle in HAZ with three dimensional heat source models in agreement with modelling rules. Part III. Non-linear analytic-numerical assessment of thermal cycle - examples
Ranatowski E.
Polish Maritime Research
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2010
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nr 3
45-52
EN
This part is continuation of PART II. Analytic solutions for the temperature distribution in HAZ – presented in the previous part of this article are transformed for computer calculation with used Mathcad programme. There are established algorithms in moving and stationary systems for thermal cycle calculating. Finally, a few analytical examples with use of C-I-N and D-E models are demonstrated.
6
Content available Problems of welding in shipbuilding - an analytic-numerical assessment of the thermal cycle in HAZ with three dimensional heat source models in agreement with modelling rules Part II An analytical assessment of thermal cycle by used C-I-N and D-E heat sources models
Ranatowski Eugeniusz
Polish Maritime Research
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2010
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nr 2
60--66
EN
This part is continuation of PART I. The basis of this analytic solution are the Fourier - Kirchhoff partial differential equation with appropriated boundary conditions. For a plate with optional thickness, the radiative heat transfer on both surfaces is taken into account. It is assumed that moving C-I-N or D-E heat sources during a very short period of time, generate an impulse of energy inducing an instantaneous thermal field in the plate area and the analytic solution is received by used Fourier transformation. These fields are being continuously summed up to obtain resultant thermal field ... . Finally, the temperature fields generated by C-I-N and D-E heat sources in both stationary and moving co-ordinates systems are established.
7
Content available remote Thermal modelling of laser welding Part I: The physical basis of laser welding
Ranatowski E.
Advances in Materials Science
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2003
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Vol. 3, nr 1(3)
34--40
EN
A physical model of laser welding process is presented. At the beginning of this paper a short characteristic of correct modeling procedure is shown. In the further part, the form of beat transport in laser welding is described. Finally the cylindrical - involution - normal (C-1-N) beat source (H-S) model and the Fourier - Kirchhoff partial differential equation are made and discussed.
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