Influence of Particle Charging on the Fume Formation Process in Arc Welding

Tashiro, Shinichi; Murphy, B. Anthony; Tanaka, Manabu

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タイトル	Influence of Particle Charging on the Fume Formation Process in Arc Welding
著者	Tashiro, Shinichi Tashiro, Shinichi
	Murphy, B. Anthony Murphy, B. Anthony
	Tanaka, Manabu Tanaka, Manabu
キーワード等	Fume
	Arc welding
	Charging
	Simulation
抄録	In order to clarify the influence of electrostatic forces caused by charging of particles on the coagulation process in fume formation in arc welding, a previously-developed fume formation model has been modified to consider the influence of charging, for both local thermodynamic equilibrium (LTE) and non-LTE conditions. The model takes into account formation of the particles from metal vapour by nucleation, growth of the particles by condensation of metal vapour, and coagulation of the particles by collisions to form secondary particles. Results have been obtained for both ballistic and Brownian motion of the particles. It was found that the growth of secondary particles is suppressed when the average particle charge becomes significant, because charging of the particle hinders collisions among secondary particles through the strong repulsive electrostatic force. Furthermore, deviations from LTE strongly affect the coagulation process, because the increased electron density at a given gas temperature increases the charging of particles. Brownian motion leads to larger secondary particles, since the average particle speed is increased. The influence of Brownian motion and particle charging cancel each other to a large extent, particularly when deviations from LTE are considered.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	42
号	1
開始ページ	1
終了ページ	9
刊行年月	2013-06
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/26599
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.42 No.1 (2013-06)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.42(1) P.1-P.9
DC.title	Influence of Particle Charging on the Fume Formation Process in Arc Welding
DC.creator	Tashiro, Shinichi
	Murphy, B. Anthony
	Tanaka, Manabu
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2013-06
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/26599
DC.subject	Fume
	Arc welding
	Charging
	Simulation
DCTERMS.abstract	In order to clarify the influence of electrostatic forces caused by charging of particles on the coagulation process in fume formation in arc welding, a previously-developed fume formation model has been modified to consider the influence of charging, for both local thermodynamic equilibrium (LTE) and non-LTE conditions. The model takes into account formation of the particles from metal vapour by nucleation, growth of the particles by condensation of metal vapour, and coagulation of the particles by collisions to form secondary particles. Results have been obtained for both ballistic and Brownian motion of the particles. It was found that the growth of secondary particles is suppressed when the average particle charge becomes significant, because charging of the particle hinders collisions among secondary particles through the strong repulsive electrostatic force. Furthermore, deviations from LTE strongly affect the coagulation process, because the increased electron density at a given gas temperature increases the charging of particles. Brownian motion leads to larger secondary particles, since the average particle speed is increased. The influence of Brownian motion and particle charging cancel each other to a large extent, particularly when deviations from LTE are considered.
citation_title	Influence of Particle Charging on the Fume Formation Process in Arc Welding
citation_author	Tashiro, Shinichi
	Murphy, B. Anthony
	Tanaka, Manabu
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2013-06
citation_journal_title	Transactions of JWRI
citation_volume	42
citation_issue	1
citation_firstpage	1
citation_lastpage	9
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/26599
citation_keywords	Fume
	Arc welding
	Charging
	Simulation

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