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jwri34_02_007
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論文情報
タイトル
Adaptive Control and Repair for Lap Welds of Aluminum Alloy Sheets Based upon In-Process Monitoring
著者
Kawahito, Yousuke
Kawahito, Yousuke
Katayama, Seiji
Katayama, Seiji
キーワード等
Adaptive control
In-process monitoring
Micro laser welding
Aluminum alloy
Repair
抄録
A new procedure of in-process monitoring and adaptive control has been developed for laser micro-spot lap welding of A3003 aluminum alloy sheets. The objective is to produce sound partial- and full-penetration welds without through-holes. In partial-penetration welds, the reflected laser beam and the radiated heat from the welding area were effective as in-process monitoring signals for detecting melting and though-hole formation in the upper sheet during laser irradiation. Laser pulse duration and peak power were controlled at every 150 µs intervals during spot welding on the basis of the heat radiation signal detecting the though-hole. In the full-penetration welds, the laser power was controlled so as to keep the value of the reflected light signal higher than the minimum and to restrict the variation of the heat radiation signal within one-third levels of the maximum increase and decrease, to prevent the formation of a through-hole. Consequently, the laser pulse peak power was properly controlled on the basis of the reflected light power and the heat radiation variation and this led to the production of sound welds at all times. The above results proved the effectiveness of in-process monitoring and the availability of adaptive control.
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
34
号
2
開始ページ
7
終了ページ
15
刊行年月
2005-12
ISSN
03874508
NCID
AA00867058
URL
http://hdl.handle.net/11094/3660
言語
英語
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.34 No.2 (2005-12)
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text
DCTERMS.bibliographicCitation
Transactions of JWRI.34(2) P.7-P.15
DC.title
Adaptive Control and Repair for Lap Welds of Aluminum Alloy Sheets Based upon In-Process Monitoring
DC.creator
Kawahito, Yousuke
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
2005-12
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/3660
DC.subject
Adaptive control
In-process monitoring
Micro laser welding
Aluminum alloy
Repair
DCTERMS.abstract
A new procedure of in-process monitoring and adaptive control has been developed for laser micro-spot lap welding of A3003 aluminum alloy sheets. The objective is to produce sound partial- and full-penetration welds without through-holes. In partial-penetration welds, the reflected laser beam and the radiated heat from the welding area were effective as in-process monitoring signals for detecting melting and though-hole formation in the upper sheet during laser irradiation. Laser pulse duration and peak power were controlled at every 150 µs intervals during spot welding on the basis of the heat radiation signal detecting the though-hole. In the full-penetration welds, the laser power was controlled so as to keep the value of the reflected light signal higher than the minimum and to restrict the variation of the heat radiation signal within one-third levels of the maximum increase and decrease, to prevent the formation of a through-hole. Consequently, the laser pulse peak power was properly controlled on the basis of the reflected light power and the heat radiation variation and this led to the production of sound welds at all times. The above results proved the effectiveness of in-process monitoring and the availability of adaptive control.
citation_title
Adaptive Control and Repair for Lap Welds of Aluminum Alloy Sheets Based upon In-Process Monitoring
citation_author
Kawahito, Yousuke
Katayama, Seiji
citation_publisher
大阪大学接合科学研究所
citation_language
英語
citation_date
2005-12
citation_journal_title
Transactions of JWRI
citation_volume
34
citation_issue
2
citation_firstpage
7
citation_lastpage
15
citation_issn
03874508
citation_public_url
http://hdl.handle.net/11094/3660
citation_keywords
Adaptive control
In-process monitoring
Micro laser welding
Aluminum alloy
Repair