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Parallel computations on fusion welding and floating zones
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-2830-0454
2003 (Swedish)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2003. , vi, 16 p.
Series
Trita-MEK, ISSN 0348-467X ; 2003:16
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-1720OAI: oai:DiVA.org:kth-1720DiVA: diva2:7679
Presentation
(English)
Note
QC 20100527Available from: 2004-06-21 Created: 2004-06-21 Last updated: 2010-05-27Bibliographically approved
List of papers
1. Modeling of Time-Dependent 3D Weld Pool Flow Due to a Moving Arc
Open this publication in new window or tab >>Modeling of Time-Dependent 3D Weld Pool Flow Due to a Moving Arc
2003 (English)In: Proceedings of High Performance Scientific Computing, 2003Conference paper, Published paper (Other academic)
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-13092 (URN)
Conference
International Conference on High Performance Scientific Computing
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
2. Modelling of time-dependent 3D weld pool flow
Open this publication in new window or tab >>Modelling of time-dependent 3D weld pool flow
2003 (English)In: Mathematical modelling of weld Phenomena 7 / [ed] Cerjak, H, 2003, 91-112 p.Conference paper, Published paper (Refereed)
Abstract [en]

The fluid flows in molten pools during arc welding are important factors. These in turn influence in overall heat and mass transfer, which determine the mechanical properties and quality of the weld fusion zone. Here, modelling results are presented concerning the time dependent weld pool flow and temperature in gas tungsten arc welding (GTA) of the difference type of stainless steels. It is proved that the temperature fields are strongly affected by the convection at the weld pool’s surfaces. With the stainless steel type 304 (low sulfur content 0.0005 weight % and high sulfur content 0.0139 weight %), the actual chaotic time dependent melt flow is obtained with a fully time dependent model. In those cases, the fluid flow in the weld pool is highly complex and it influenced the weld pool`s depth and width. For the 645 SMO steel, which has an extremely low sulfur content and low conductivity, the chaotic fluid flows did not appear. The calculated geometry of the weld fusion zone and heat affected zone were in good agreement with the experimental results, both with or without chaotic fluid flows.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-13093 (URN)3-901351-99-X (ISBN)
Conference
International Seminar on the 'Numerical Analysis of Weldability'
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
3. Three-dimensional modelling of radial segregation due to weak convection
Open this publication in new window or tab >>Three-dimensional modelling of radial segregation due to weak convection
2004 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 269, 454-463 p.Article in journal (Refereed) Published
Abstract [en]

A comprehensive three-dimensional, time-dependent model of heat, momentum and solute transfer during solidification is carried out to illustrate the influence of weak convection, caused by surface tension forces, on radial dopant segregation occurring in crystal growth under micro-gravity conditions. 3D adaptive finite element method is used in order to simulate the motion and deformation of the solidification interface. The geometry studied is a Bridgman configuration with a partly coated surface. The small slots in the coating gives a free surface in a controlled way, and is varied in order to alter the Marangoni flow. In this study, A comparison is made between the numerical results and the experimental results. A good agreement has been observed for the effective distribution coefficient keff and for the radial segregation [Delta]c’. The radial dopant segregation is affected by weak convection.

Keyword
3D numerical simulation, Adaptive finite element, Automated code generation, Radial segregation, Floating zone technique, Microgravity conditions
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-13094 (URN)10.1016/j.jcrysgro.2004.05.076 (DOI)000223813300039 ()2-s2.0-4344633801 (Scopus ID)
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2017-12-12Bibliographically approved

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Do-Quang, Minh

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