Weldability and Keyhole Behavior in Remote Welding of three Zn-Coated Steel Sheets

Lee, Su-Jin; Katayama, Seiji; Kawahito, Yousuke; Kinoshita, Keisuke

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タイトル	Weldability and Keyhole Behavior in Remote Welding of three Zn-Coated Steel Sheets
著者	Lee, Su-Jin Lee, Su-Jin
	Katayama, Seiji Katayama, Seiji
	Kawahito, Yousuke Kawahito, Yousuke
	Kinoshita, Keisuke Kinoshita, Keisuke
キーワード等	Zn-coated steel
	Remote welding
	Disk laser
	Gap
	Lap welding of three steel sheets
	Keyhole behavior
	Porosity formation
抄録	Zinc-coated steels are widely used in automobile bodies. Laser welding, which offers much advantage over the conventional welding with MAG, CO_2 arc, etc. in terms of improved weld quality, high-speed and easy automation, has been developed for cars. However, in laser lap welding of zinc-coated steel sheets without gaps, defects such as underfilled beads or porosity are easily formed due to the higher pressure of zinc vapor trapped in the molten pool because of the lower boiling point of zinc (1180 K) with respect to the melting point of steel (Fe, 1803 K). Laser lap welding results of two Zn-coated steel sheets have been reported. However, there are not enough data for welding of three Zn-coated steel sheets. Therefore, to understand laser lap weldability of three Zn-coated steel sheets, lap welding of two or three sheets with and without gaps was performed, and then molten pool motions, spattering and keyhole behavior during welding were observed by high speed video cameras and X-ray transmission real-time imaging apparatus. Lap welding of three steel sheets was difficult but acceptably good welds were produced in sheets with the upper and lower gaps of 0.1 and 0.1 mm, 0.1 and 0.2 mm or 0.2 and 0.1mm, respectively. Bubble generation leading to porosity formation was observed, and it was confirmed that welding phenomena were different depending upon the gap levels.
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	11
終了ページ	15
刊行年月	2013-06
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/26597
言語	英語

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.11-P.15
DC.title	Weldability and Keyhole Behavior in Remote Welding of three Zn-Coated Steel Sheets
DC.creator	Lee, Su-Jin
	Katayama, Seiji
	Kawahito, Yousuke
	Kinoshita, Keisuke
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/11094/26597
DC.subject	Zn-coated steel
	Remote welding
	Disk laser
	Gap
	Lap welding of three steel sheets
	Keyhole behavior
	Porosity formation
DCTERMS.abstract	Zinc-coated steels are widely used in automobile bodies. Laser welding, which offers much advantage over the conventional welding with MAG, CO_2 arc, etc. in terms of improved weld quality, high-speed and easy automation, has been developed for cars. However, in laser lap welding of zinc-coated steel sheets without gaps, defects such as underfilled beads or porosity are easily formed due to the higher pressure of zinc vapor trapped in the molten pool because of the lower boiling point of zinc (1180 K) with respect to the melting point of steel (Fe, 1803 K). Laser lap welding results of two Zn-coated steel sheets have been reported. However, there are not enough data for welding of three Zn-coated steel sheets. Therefore, to understand laser lap weldability of three Zn-coated steel sheets, lap welding of two or three sheets with and without gaps was performed, and then molten pool motions, spattering and keyhole behavior during welding were observed by high speed video cameras and X-ray transmission real-time imaging apparatus. Lap welding of three steel sheets was difficult but acceptably good welds were produced in sheets with the upper and lower gaps of 0.1 and 0.1 mm, 0.1 and 0.2 mm or 0.2 and 0.1mm, respectively. Bubble generation leading to porosity formation was observed, and it was confirmed that welding phenomena were different depending upon the gap levels.
citation_title	Weldability and Keyhole Behavior in Remote Welding of three Zn-Coated Steel Sheets
citation_author	Lee, Su-Jin
	Katayama, Seiji
	Kawahito, Yousuke
	Kinoshita, Keisuke
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	11
citation_lastpage	15
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/26597
citation_keywords	Zn-coated steel
	Remote welding
	Disk laser
	Gap
	Lap welding of three steel sheets
	Keyhole behavior
	Porosity formation

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