Basic Numerical Study on Gap Influence of Residual Stress and Distortion during High-Brightness Laser Butt Welding

Mori, Daiki; Murakawa Hidekazu; Serizawa, Hisashi

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タイトル	Basic Numerical Study on Gap Influence of Residual Stress and Distortion during High-Brightness Laser Butt Welding
著者	Mori, Daiki Mori, Daiki
	Murakawa Hidekazu Murakawa Hidekazu
	Serizawa, Hisashi Serizawa, Hisashi
キーワード等	Fiber Laser
	Butt Welding
	Gap
	Thermal Elastic Plastic Finite Element Analysis
	Residual Stress
	Welding Distortion
抄録	High-brightness laser such as fiber laser or disk laser is expected to minimize the total heat input energy in welding due to its high beam quality, and the welding residual stress and distortion also seem to be reduced as a result. However, the diameter of high-brightness laser beam is less than 0.6 mm and it is difficult to set the beam position to contact face between two parts because in general there would be a gap due to quality of parts. In this study, in order to reveal the effect of gap on the residual stress and the welding distortion during fiber laser welding, the butt welding of two plates were examined through the thermal elastic-plastic analysis with a new gap element. From the result of thermal analyses, it was found that the homogeneous ellipsoid body could be applicable to model the shape of heat source for the fiber laser and the gap width would not influence the penetration shape when the gap width was changed from 0.1 to 0.25 mm. In addition, the elastic-plastic analyses indicated that the transverse shrinkage slightly increased with increasing the gap width, while this shrinkage without gap was much smaller than that with gap. Also, it was revealed that the welding speed largely affects both the welding residual stress and distortion. Moreover, it was found that the residual stress was almost independent of the jig position, while the position of fixtures slightly affected the transverse shrinkage.
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	2
開始ページ	37
終了ページ	43
刊行年月	2013-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/27406
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(2) P.37-P.43
DC.title	Basic Numerical Study on Gap Influence of Residual Stress and Distortion during High-Brightness Laser Butt Welding
DC.creator	Mori, Daiki
	Murakawa Hidekazu
	Serizawa, Hisashi
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	2013-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/27406
DC.subject	Fiber Laser
	Butt Welding
	Gap
	Thermal Elastic Plastic Finite Element Analysis
	Residual Stress
	Welding Distortion
DCTERMS.abstract	High-brightness laser such as fiber laser or disk laser is expected to minimize the total heat input energy in welding due to its high beam quality, and the welding residual stress and distortion also seem to be reduced as a result. However, the diameter of high-brightness laser beam is less than 0.6 mm and it is difficult to set the beam position to contact face between two parts because in general there would be a gap due to quality of parts. In this study, in order to reveal the effect of gap on the residual stress and the welding distortion during fiber laser welding, the butt welding of two plates were examined through the thermal elastic-plastic analysis with a new gap element. From the result of thermal analyses, it was found that the homogeneous ellipsoid body could be applicable to model the shape of heat source for the fiber laser and the gap width would not influence the penetration shape when the gap width was changed from 0.1 to 0.25 mm. In addition, the elastic-plastic analyses indicated that the transverse shrinkage slightly increased with increasing the gap width, while this shrinkage without gap was much smaller than that with gap. Also, it was revealed that the welding speed largely affects both the welding residual stress and distortion. Moreover, it was found that the residual stress was almost independent of the jig position, while the position of fixtures slightly affected the transverse shrinkage.
citation_title	Basic Numerical Study on Gap Influence of Residual Stress and Distortion during High-Brightness Laser Butt Welding
citation_author	Mori, Daiki
	Murakawa Hidekazu
	Serizawa, Hisashi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2013-12
citation_journal_title	Transactions of JWRI
citation_volume	42
citation_issue	2
citation_firstpage	37
citation_lastpage	43
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/27406
citation_keywords	Fiber Laser
	Butt Welding
	Gap
	Thermal Elastic Plastic Finite Element Analysis
	Residual Stress
	Welding Distortion

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