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Abstract
In order to clarify fume formation mechanism in arc welding, quantitative investigation based on understanding of interaction among the electrode, arc and weld pool is indispensable. A fume formation model consisting of heterogeneous condensation model, homogeneous nucleation model and coagulation model has been developed and coupled with the GMA welding model. A series of processes from evaporation of metal vapor to fume formation from the metal vapor was totally investigated by employing this simulation model. This paper aims to visualize the fume formation process and clarify the fume formation mechanism theoretically through numerical analysis. Furthermore, the reliability of the simulation model was also evaluated through comparison of the simulation result with experimental result. As a result, it was found that most part of the fume was produced in downstream region of the arc originating from the metal vapor evaporated mainly from the droplet in argon GMA welding. This kind of the fume was constituted of particles with size of several tens nm. On the other hand, if the metal transfer becomes unstable and the metal vapor near the droplet diffuses directly toward the surroundings of the arc not getting on the plasma flow, the size of particles reaches several hundreds nm.
Journal
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- Transactions of JWRI
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Transactions of JWRI 40 (2), 21-27, 2011-12
Joining and Welding Research Institute, Osaka University
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Keywords
Details 詳細情報について
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- CRID
- 1390012777802234112
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- NII Article ID
- 120004839231
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- NII Book ID
- AA00867058
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- DOI
- 10.18910/5034
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- HANDLE
- 11094/5034
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- ISSN
- 03874508
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- CiNii Articles