Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys

In this manuscript, weld pool dynamics in laser welding of various series of aluminum alloys were investigated by the in situ X-ray phase contrast imaging system. The experimental results showed that metal irradiated by laser was evaporated immediately, which generated the keyhole. Then metal surrou...

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Autores principales: Miyagi, Masanori, Wang, Hongze, Yoshida, Ryohei, Kawahito, Yousuke, Kawakami, Hiroshi, Shoubu, Takahisa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6113294/
https://www.ncbi.nlm.nih.gov/pubmed/30154421
http://dx.doi.org/10.1038/s41598-018-31350-4
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author Miyagi, Masanori
Wang, Hongze
Yoshida, Ryohei
Kawahito, Yousuke
Kawakami, Hiroshi
Shoubu, Takahisa
author_facet Miyagi, Masanori
Wang, Hongze
Yoshida, Ryohei
Kawahito, Yousuke
Kawakami, Hiroshi
Shoubu, Takahisa
author_sort Miyagi, Masanori
collection PubMed
description In this manuscript, weld pool dynamics in laser welding of various series of aluminum alloys were investigated by the in situ X-ray phase contrast imaging system. The experimental results showed that metal irradiated by laser was evaporated immediately, which generated the keyhole. Then metal surrounding the keyhole was melted gradually with the heat from keyhole. The growth rate of keyhole depth had a positive linear correlation with the total content of low boiling temperature elements (TCE), so did the keyhole depth and diameter at the stable stage. Longitudinal view area of the molten pool had a negative linear correlation with the thermal conductivity of aluminum alloy. The measured laser absorption rate had the same variation trend with the ratio of keyhole depth to diameter, and the highest absorption rate of 58% appeared in laser welding of aluminum alloy with TCE equal to 2.1%. Violent fluctuation in keyhole shape was avoided in aluminum alloy with TCE lower than 2.1%, where the surface tension and recoil pressure of metal vapor were balanced. To sum up, the effect of alloy element on weld pool dynamics in laser welding of aluminum alloys was firstly quantified in this manuscript.
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spelling pubmed-61132942018-09-04 Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys Miyagi, Masanori Wang, Hongze Yoshida, Ryohei Kawahito, Yousuke Kawakami, Hiroshi Shoubu, Takahisa Sci Rep Article In this manuscript, weld pool dynamics in laser welding of various series of aluminum alloys were investigated by the in situ X-ray phase contrast imaging system. The experimental results showed that metal irradiated by laser was evaporated immediately, which generated the keyhole. Then metal surrounding the keyhole was melted gradually with the heat from keyhole. The growth rate of keyhole depth had a positive linear correlation with the total content of low boiling temperature elements (TCE), so did the keyhole depth and diameter at the stable stage. Longitudinal view area of the molten pool had a negative linear correlation with the thermal conductivity of aluminum alloy. The measured laser absorption rate had the same variation trend with the ratio of keyhole depth to diameter, and the highest absorption rate of 58% appeared in laser welding of aluminum alloy with TCE equal to 2.1%. Violent fluctuation in keyhole shape was avoided in aluminum alloy with TCE lower than 2.1%, where the surface tension and recoil pressure of metal vapor were balanced. To sum up, the effect of alloy element on weld pool dynamics in laser welding of aluminum alloys was firstly quantified in this manuscript. Nature Publishing Group UK 2018-08-28 /pmc/articles/PMC6113294/ /pubmed/30154421 http://dx.doi.org/10.1038/s41598-018-31350-4 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Miyagi, Masanori
Wang, Hongze
Yoshida, Ryohei
Kawahito, Yousuke
Kawakami, Hiroshi
Shoubu, Takahisa
Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title_full Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title_fullStr Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title_full_unstemmed Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title_short Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
title_sort effect of alloy element on weld pool dynamics in laser welding of aluminum alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6113294/
https://www.ncbi.nlm.nih.gov/pubmed/30154421
http://dx.doi.org/10.1038/s41598-018-31350-4
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