Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel

Kawahito, Yousuke; Mizutani, Masami; Katayama, Seiji

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タイトル	Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel
著者	Kawahito, Yousuke Kawahito, Yousuke
	Mizutani, Masami Mizutani, Masami
	Katayama, Seiji Katayama, Seiji
キーワード等	Activating fluxes
	Electron Beam
	Welding
抄録	Fiber laser has been receiving great attention due to its advantages of high efficiency, high power and high beam quality, and is expected as one of the most desirable heat sources for high-speed and deep-penetration welding. In this research, therefore, in bead-on-plate welding of Type 304 stainless steel plates with 6 kW fiber laser, the effects of laser power, power density and welding speed on the formation of sound welds were investigated with four laser beams of 130, 200, 360 and 560 μm in spot diameter, and their welding phenomena were explained with high-speed video cameras and X-ray transmission real-time imaging system. The weld beads showed a keyhole type of penetration at all diameters, and the maximum penetration of 11 mm in depth was obtained at 130 μm spot diameter and 0.6 m/min welding speed. It was found that the laser power density exerted a remarkable effect on the increase in weld penetration at higher welding speeds, and sound partially-penetrated welds without welding defects such as porosity, underfilling or humping could be produced at wide process windows of the welding speeds between 4.5 and 10 m/min with fiber laser beams of 360 μm or 560 μm in spot diameter. The high-speed video observation pictures and the X-ray images of the welding phenomena at 6 m/min welding speed and 360 μm spot diameter show that a sound weld bead was formed as a result of the long molten pool suppressing and accommodating spattering and a stable keyhole generating no bubbles from the tip, respectively.
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	36
号	2
開始ページ	11
終了ページ	15
刊行年月	2007-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/7955
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.36(2) P.11-P.15
DC.title	Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel
DC.creator	Kawahito, Yousuke
	Mizutani, Masami
	Katayama, Seiji
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	2007-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/7955
DC.subject	Activating fluxes
	Electron Beam
	Welding
DCTERMS.abstract	Fiber laser has been receiving great attention due to its advantages of high efficiency, high power and high beam quality, and is expected as one of the most desirable heat sources for high-speed and deep-penetration welding. In this research, therefore, in bead-on-plate welding of Type 304 stainless steel plates with 6 kW fiber laser, the effects of laser power, power density and welding speed on the formation of sound welds were investigated with four laser beams of 130, 200, 360 and 560 μm in spot diameter, and their welding phenomena were explained with high-speed video cameras and X-ray transmission real-time imaging system. The weld beads showed a keyhole type of penetration at all diameters, and the maximum penetration of 11 mm in depth was obtained at 130 μm spot diameter and 0.6 m/min welding speed. It was found that the laser power density exerted a remarkable effect on the increase in weld penetration at higher welding speeds, and sound partially-penetrated welds without welding defects such as porosity, underfilling or humping could be produced at wide process windows of the welding speeds between 4.5 and 10 m/min with fiber laser beams of 360 μm or 560 μm in spot diameter. The high-speed video observation pictures and the X-ray images of the welding phenomena at 6 m/min welding speed and 360 μm spot diameter show that a sound weld bead was formed as a result of the long molten pool suppressing and accommodating spattering and a stable keyhole generating no bubbles from the tip, respectively.
citation_title	Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel
citation_author	Kawahito, Yousuke
	Mizutani, Masami
	Katayama, Seiji
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2007-12
citation_journal_title	Transactions of JWRI
citation_volume	36
citation_issue	2
citation_firstpage	11
citation_lastpage	15
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/7955
citation_keywords	Activating fluxes
	Electron Beam
	Welding

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