Influence of surface state in micro-welding of copper by Nd:YAG laser

Martin Ruthandi Maina; Yasuhiro Okamoto; Reiki Inoue; Shin Ichi Nakashiba; Akira Okada; Tomokazu Sakagawa

doi:10.3390/app8122365

Influence of surface state in micro-welding of copper by Nd:YAG laser

Martin Ruthandi Maina, Yasuhiro Okamoto, Reiki Inoue, Shin Ichi Nakashiba, Akira Okada, Tomokazu Sakagawa

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Laser welding of copper is characterized by low and unstable light absorption around 1000 nm wavelength. Combination of high thermal conductivity and low melting point makes it difficult to obtain good welding quality and leads to low energy utilization. To improve efficiency and welding quality, a technique to enhance process stability using 1064 nm wavelength Nd:YAG laser has been proposed, and absorption rate and molten volume in laser micro-welding were discussed. Since the surface state of specimen affects absorption phenomena, effects of surface shape and surface roughness were investigated. Absorption rate and molten volume were increased by creating appropriate concave holes and by controlled surface roughness. Stable micro-welding process with deep penetration and good surface quality was achieved for transitional processing condition between heat conduction and keyhole welding, by enhanced absorption rate.

Original language	English
Article number	2364
Journal	Applied Sciences (Switzerland)
Volume	8
Issue number	12
DOIs	https://doi.org/10.3390/app8122365
Publication status	Published - Nov 23 2018

Keywords

Absorption rate
Copper
Heat conduction
Keyhole
Laser welding
Nd:YAG laser

ASJC Scopus subject areas

Materials Science(all)
Instrumentation
Engineering(all)
Process Chemistry and Technology
Computer Science Applications
Fluid Flow and Transfer Processes

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10.3390/app8122365

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title = "Influence of surface state in micro-welding of copper by Nd:YAG laser",

abstract = "Laser welding of copper is characterized by low and unstable light absorption around 1000 nm wavelength. Combination of high thermal conductivity and low melting point makes it difficult to obtain good welding quality and leads to low energy utilization. To improve efficiency and welding quality, a technique to enhance process stability using 1064 nm wavelength Nd:YAG laser has been proposed, and absorption rate and molten volume in laser micro-welding were discussed. Since the surface state of specimen affects absorption phenomena, effects of surface shape and surface roughness were investigated. Absorption rate and molten volume were increased by creating appropriate concave holes and by controlled surface roughness. Stable micro-welding process with deep penetration and good surface quality was achieved for transitional processing condition between heat conduction and keyhole welding, by enhanced absorption rate.",

keywords = "Absorption rate, Copper, Heat conduction, Keyhole, Laser welding, Nd:YAG laser",

author = "Maina, {Martin Ruthandi} and Yasuhiro Okamoto and Reiki Inoue and Nakashiba, {Shin Ichi} and Akira Okada and Tomokazu Sakagawa",

note = "Funding Information: Acknowledgments: The authors acknowledge the support given by Japanese Ministry of Education, Culture, Sports, Science and Technology, and Jomo Kenyatta University of Agriculture and Technology, Kenya. Funding Information: Funding: This research was funded by JSPS KAKEN Grant Number 15K05725. Publisher Copyright: {\textcopyright} 2018 by the authors.",

year = "2018",

month = nov,

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doi = "10.3390/app8122365",

language = "English",

volume = "8",

journal = "Applied Sciences (Switzerland)",

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AU - Maina, Martin Ruthandi

AU - Okamoto, Yasuhiro

AU - Inoue, Reiki

AU - Nakashiba, Shin Ichi

AU - Okada, Akira

AU - Sakagawa, Tomokazu

N1 - Funding Information: Acknowledgments: The authors acknowledge the support given by Japanese Ministry of Education, Culture, Sports, Science and Technology, and Jomo Kenyatta University of Agriculture and Technology, Kenya. Funding Information: Funding: This research was funded by JSPS KAKEN Grant Number 15K05725. Publisher Copyright: © 2018 by the authors.

PY - 2018/11/23

Y1 - 2018/11/23

N2 - Laser welding of copper is characterized by low and unstable light absorption around 1000 nm wavelength. Combination of high thermal conductivity and low melting point makes it difficult to obtain good welding quality and leads to low energy utilization. To improve efficiency and welding quality, a technique to enhance process stability using 1064 nm wavelength Nd:YAG laser has been proposed, and absorption rate and molten volume in laser micro-welding were discussed. Since the surface state of specimen affects absorption phenomena, effects of surface shape and surface roughness were investigated. Absorption rate and molten volume were increased by creating appropriate concave holes and by controlled surface roughness. Stable micro-welding process with deep penetration and good surface quality was achieved for transitional processing condition between heat conduction and keyhole welding, by enhanced absorption rate.

AB - Laser welding of copper is characterized by low and unstable light absorption around 1000 nm wavelength. Combination of high thermal conductivity and low melting point makes it difficult to obtain good welding quality and leads to low energy utilization. To improve efficiency and welding quality, a technique to enhance process stability using 1064 nm wavelength Nd:YAG laser has been proposed, and absorption rate and molten volume in laser micro-welding were discussed. Since the surface state of specimen affects absorption phenomena, effects of surface shape and surface roughness were investigated. Absorption rate and molten volume were increased by creating appropriate concave holes and by controlled surface roughness. Stable micro-welding process with deep penetration and good surface quality was achieved for transitional processing condition between heat conduction and keyhole welding, by enhanced absorption rate.

KW - Absorption rate

KW - Copper

KW - Heat conduction

KW - Keyhole

KW - Laser welding

KW - Nd:YAG laser

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ER -

Influence of surface state in micro-welding of copper by Nd:YAG laser

Abstract

Keywords

ASJC Scopus subject areas

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