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jwri36_02_011
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論文情報
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
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.36 No.2 (2007-12)
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著者版フラグ
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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