Elucidation of droplet detachment mechanism in metal-cored arc welding

Tashiro, Shinichi; Trinh, Quang Ngoc; Le, Dang Khoi; Suga, Tetsuo; Kakizaki, Tomonori; Yamazaki, Kei; Murphy, Anthony B.; Lersvanichkool, Ackadech; Bui, Van Hanh; Tanaka, Manabu

doi:https://doi.org/10.1016/j.jmapro.2024.07.040

Elucidation of droplet detachment mechanism in metal-cored arc welding

Tashiro, Shinichi; Trinh, Quang Ngoc; Le, Dang Khoi et al.

Journal of Manufacturing Processes, 2024, 124, 1583-1605

Number of Access:690（2025-08-14 04:54 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98174

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Title	Elucidation of droplet detachment mechanism in metal-cored arc welding
Creator	NRID 1000070432424 1000070432424 researchmap permalink d8dshw3z d8dshw3z Scopus Author ID 15833130200 15833130200 CreatorName Tashiro, Shinichi
	CreatorName Trinh, Quang Ngoc
	CreatorName Le, Dang Khoi
	researchmap permalink TS2529 TS2529 NRID 1000010863102 1000010863102 CreatorName Suga, Tetsuo
	CreatorName Kakizaki, Tomonori
	CreatorName Yamazaki, Kei
	CreatorName Murphy, Anthony B.
	CreatorName Lersvanichkool, Ackadech
	CreatorName Bui, Van Hanh
	NRID 1000020243272 1000020243272 researchmap permalink read0014392 read0014392 Scopus Author ID 25641191700 25641191700 CreatorName Tanaka, Manabu
Description	Tashiro S., Trinh Q.N., Le D.K., et al. Elucidation of droplet detachment mechanism in metal-cored arc welding. Journal of Manufacturing Processes 124, 1583 (2024); https://doi.org/10.1016/j.jmapro.2024.07.040.
Abstract	It has been demonstrated experimentally that a globular transfer mode tends to occur in argon gas metal arc welding using a metal-cored wire (called metal-red arc welding (MCAW)) even under conditions where a spray transfer mode occurs when a solid wire is used. This study aimed to elucidate the droplet detachment mechanism in MCAW using numerical simulations. It was observed that in the initial stage of droplet growth, the argon arc attachment (which carried a large portion of the current) was located on the metal sheath surrounding the unmelted flux. Moreover, an eddy containing an upward flow at the wire axis was formed inside the droplet. When this eddy was formed, the droplet volume increased owing to wire melting. However, neck formation did not occur. This is considered to be because only a small portion of the current is conducted through the droplet, and the Lorentz force acting on the droplet is significantly weak. Thereafter, when the droplet grew to a certain extent and the arc attachment moved below the unmelted flux position, the Lorentz force acted strongly and almost uniformly on the droplet. Accordingly, this eddy disappeared, and the flow abruptly transitioned to a downward unidirectional high-speed flow. Consequently, the droplet began to extend downward to form a neck, which caused it to detach. For these reasons, the time required for droplet detachment increased, and the metal transfer frequency decreased compared with the case of the solid wire. This explains the observation that globular transfer persists in metal-cored wires at currents higher than those for which the transition to spray transfer has occurred for solid wires.
Publisher	Elsevier Ltd
Source Title	Journal of Manufacturing Processes
Volume (Issue)	124
Page	1583-1605
Date of Issued	2024-08-30
Language	English
Handle URL	https://hdl.handle.net/11094/98174
PISSN	15266125
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.jmapro.2024.07.040
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCTERMS.bibliographicCitation	Journal of Manufacturing Processes. 2024, 124, p. 1583-1605
DC.title	Elucidation of droplet detachment mechanism in metal-cored arc welding
DC.creator	Tashiro, Shinichi
	Trinh, Quang Ngoc
	Le, Dang Khoi
	Suga, Tetsuo
	Kakizaki, Tomonori
	Yamazaki, Kei
	Murphy, Anthony B.
	Lersvanichkool, Ackadech
	Bui, Van Hanh
	Tanaka, Manabu
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	English
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-08-30
DC.identifier	https://doi.org/10.1016/j.jmapro.2024.07.040
DC.description	Tashiro S., Trinh Q.N., Le D.K., et al. Elucidation of droplet detachment mechanism in metal-cored arc welding. Journal of Manufacturing Processes 124, 1583 (2024); https://doi.org/10.1016/j.jmapro.2024.07.040.
DCTERMS.abstract	It has been demonstrated experimentally that a globular transfer mode tends to occur in argon gas metal arc welding using a metal-cored wire (called metal-red arc welding (MCAW)) even under conditions where a spray transfer mode occurs when a solid wire is used. This study aimed to elucidate the droplet detachment mechanism in MCAW using numerical simulations. It was observed that in the initial stage of droplet growth, the argon arc attachment (which carried a large portion of the current) was located on the metal sheath surrounding the unmelted flux. Moreover, an eddy containing an upward flow at the wire axis was formed inside the droplet. When this eddy was formed, the droplet volume increased owing to wire melting. However, neck formation did not occur. This is considered to be because only a small portion of the current is conducted through the droplet, and the Lorentz force acting on the droplet is significantly weak. Thereafter, when the droplet grew to a certain extent and the arc attachment moved below the unmelted flux position, the Lorentz force acted strongly and almost uniformly on the droplet. Accordingly, this eddy disappeared, and the flow abruptly transitioned to a downward unidirectional high-speed flow. Consequently, the droplet began to extend downward to form a neck, which caused it to detach. For these reasons, the time required for droplet detachment increased, and the metal transfer frequency decreased compared with the case of the solid wire. This explains the observation that globular transfer persists in metal-cored wires at currents higher than those for which the transition to spray transfer has occurred for solid wires.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	98174
citation_title	Elucidation of droplet detachment mechanism in metal-cored arc welding
citation_author	Tashiro, Shinichi
	Trinh, Quang Ngoc
	Le, Dang Khoi
	Suga, Tetsuo
	Kakizaki, Tomonori
	Yamazaki, Kei
	Murphy, Anthony B.
	Lersvanichkool, Ackadech
	Bui, Van Hanh
	Tanaka, Manabu
citation_publisher	Elsevier Ltd
citation_language	English
citation_date	2024-08-30
citation_journal_title	Journal of Manufacturing Processes
citation_volume	124
citation_firstpage	1583
citation_lastpage	1605
citation_doi	https://doi.org/10.1016/j.jmapro.2024.07.040
citation_public_url	https://hdl.handle.net/11094/98174

Elucidation of droplet detachment mechanism in metal-cored arc welding

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