Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing

Since the development of the laser in the 1960s a rapid development of research interests in science and technology took place. Since then, the need of laser application in industrials such as automotive, aerospace and electronics is increasing because of several advantages like automation worthines...

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Main Authors:	Qistina, Z., M. H., Aiman, M., Ishak, T., Ariga
Format:	Conference or Workshop Item
Language:	English English
Published:	Universiti Malaysia Pahang 2019
Subjects:	TJ Mechanical engineering and machinery TS Manufactures
Online Access:	http://umpir.ump.edu.my/id/eprint/26703/ http://umpir.ump.edu.my/id/eprint/26703/1/48.%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf http://umpir.ump.edu.my/id/eprint/26703/2/48.1%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf

id	ump-26703
recordtype	eprints
spelling	ump-267032019-12-09T07:06:53Z http://umpir.ump.edu.my/id/eprint/26703/ Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing Qistina, Z. M. H., Aiman M., Ishak T., Ariga TJ Mechanical engineering and machinery TS Manufactures Since the development of the laser in the 1960s a rapid development of research interests in science and technology took place. Since then, the need of laser application in industrials such as automotive, aerospace and electronics is increasing because of several advantages like automation worthiness, noncontact processing and product quality improvement. In this present study, the effect of Laser Surface Modification (LSM) on pure copper plate towards the laser energy absorption during indirect laser brazing process was studied. The laser brazing experiment was conducted inside a chamber under controlled vacuum pressure with 400Pa and irradiated with constant 140Watt laser power. The defocusing features for laser brazing was used in order to find better focal position. Accordingly, the focal length for this laser brazing experiment was set to the focus point at 124 mm from the focal plane. Meanwhile, during LSM process, laser parameters such as laser speed and focus length has been kept constant throughout the surface modification process. Yet, the laser power and laser frequency have been varied from 9Watt to 27Watt and 10kHz to 80kHz respectively. Apparently, surface ablation and oxide layer formation were presented during LSM process. These two surface integrities were found to be the factors of increasing laser energy absorption. It was discovered that an increase in surface roughness and oxide layer formation are able to absorb more laser energy which then results an increase in brazing temperature during laser brazing. This is because, increasing surface roughness will scatter the laser energy over a larger surface area, multiply the reflections in the surface irregularities and the oxide layer will enhance the interference phenomena of laser energy occurring inside the oxide layer. Both mechanisms increase laser energy absorptivity during laser brazing which results a high brazing temperature. Universiti Malaysia Pahang 2019 Conference or Workshop Item PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/26703/1/48.%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf pdf en http://umpir.ump.edu.my/id/eprint/26703/2/48.1%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf Qistina, Z. and M. H., Aiman and M., Ishak and T., Ariga (2019) Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing. In: International Conference on Mechanical Engineering Research (ICMER) 2019, 30-31 Julai 2019 , Vistana Hotel, Kuantan, Pahang, Malaysia. pp. 1-7.. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TJ Mechanical engineering and machinery TS Manufactures
spellingShingle	TJ Mechanical engineering and machinery TS Manufactures Qistina, Z. M. H., Aiman M., Ishak T., Ariga Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
description	Since the development of the laser in the 1960s a rapid development of research interests in science and technology took place. Since then, the need of laser application in industrials such as automotive, aerospace and electronics is increasing because of several advantages like automation worthiness, noncontact processing and product quality improvement. In this present study, the effect of Laser Surface Modification (LSM) on pure copper plate towards the laser energy absorption during indirect laser brazing process was studied. The laser brazing experiment was conducted inside a chamber under controlled vacuum pressure with 400Pa and irradiated with constant 140Watt laser power. The defocusing features for laser brazing was used in order to find better focal position. Accordingly, the focal length for this laser brazing experiment was set to the focus point at 124 mm from the focal plane. Meanwhile, during LSM process, laser parameters such as laser speed and focus length has been kept constant throughout the surface modification process. Yet, the laser power and laser frequency have been varied from 9Watt to 27Watt and 10kHz to 80kHz respectively. Apparently, surface ablation and oxide layer formation were presented during LSM process. These two surface integrities were found to be the factors of increasing laser energy absorption. It was discovered that an increase in surface roughness and oxide layer formation are able to absorb more laser energy which then results an increase in brazing temperature during laser brazing. This is because, increasing surface roughness will scatter the laser energy over a larger surface area, multiply the reflections in the surface irregularities and the oxide layer will enhance the interference phenomena of laser energy occurring inside the oxide layer. Both mechanisms increase laser energy absorptivity during laser brazing which results a high brazing temperature.
format	Conference or Workshop Item
author	Qistina, Z. M. H., Aiman M., Ishak T., Ariga
author_facet	Qistina, Z. M. H., Aiman M., Ishak T., Ariga
author_sort	Qistina, Z.
title	Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
title_short	Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
title_full	Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
title_fullStr	Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
title_full_unstemmed	Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing
title_sort	effect of laser surface modification (lsm) on laser energy absorption for laser brazing
publisher	Universiti Malaysia Pahang
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/26703/ http://umpir.ump.edu.my/id/eprint/26703/1/48.%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf http://umpir.ump.edu.my/id/eprint/26703/2/48.1%20Effect%20of%20Laser%20Surface%20Modification%20%28LSM%29%20on%20laser.pdf
first_indexed	2023-09-18T22:41:44Z
last_indexed	2023-09-18T22:41:44Z
_version_	1777416960214040576

Effect of Laser Surface Modification (LSM) on laser energy absorption for laser brazing

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