Staff View: Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)

Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)

This paper studies the influence of Nd:YAG (neodymium-doped yttrium aluminium garnet) laser process parameters on laser drilled hole quality. Ti-6Al-4V of 1 mm and 3 mm thickness were used as the workpiece substrate. The principal findings are mainly based on minimising the taper angle in laser dril...

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Main Authors:	Bahar, N. D., Marimuthu, S., Yahya, W. J.
Format:	Conference or Workshop Item
Published:	Institute of Physics Publishing 2016
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/72978/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84998880803&doi=10.1088%2f1757-899X%2f152%2f1%2f012056&partnerID=40&md5=9f68797ee6d56245cce80dc9fe2847d4
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id	my.utm.72978
record_format	eprints
spelling	my.utm.729782017-11-29T23:58:37Z http://eprints.utm.my/id/eprint/72978/ Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V) Bahar, N. D. Marimuthu, S. Yahya, W. J. T Technology (General) This paper studies the influence of Nd:YAG (neodymium-doped yttrium aluminium garnet) laser process parameters on laser drilled hole quality. Ti-6Al-4V of 1 mm and 3 mm thickness were used as the workpiece substrate. The principal findings are mainly based on minimising the taper angle in laser drilled holes, reducing the heat affected zone and reducing the production of spatter. Identification of key process variables associated with laser drilling process is accomplished by trial experimentation. Using the identified key process variables, further experiments were then performed with the assistance of statistical design of experiment (DOE) to find the interaction and individual effects of various laser process parameters on laser drilled hole quality. The lowest taper angle of 1.8 degrees was achieved with use of nitrogen as the assist gas. Furthermore, from the laser process observations, it was found that laser power significantly affects the quality of the laser drilled hole. Increase in laser power would increase the hole size and result in more spatter on the entry hole surfaces. The nozzle focus position substantially influenced the laser drilled hole size. The amount of spatter deposits increased with decrease in the nozzle offset. Increase in laser frequency significantly increased the exit diameter, which resulted in smaller taper angle. Number of pulse required to drill through a workpiece depends on the material properties and physical properties of the material. For 1mm Ti-6Al-4V, a minimum of two pulses was required to successfully removed the material during drilling and a minimum of 4 pulses was required to drill through the same material with 3mm thickness. Institute of Physics Publishing 2016 Conference or Workshop Item PeerReviewed Bahar, N. D. and Marimuthu, S. and Yahya, W. J. (2016) Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V). In: 6th Innovation in Aerospace Engineering and Technology, AEROTECH 2016, 8 November 2016 through 9 November 2016, Kuala Lumpur; Malaysia. https://www.scopus.com/inward/record.uri?eid=2-s2.0-84998880803&doi=10.1088%2f1757-899X%2f152%2f1%2f012056&partnerID=40&md5=9f68797ee6d56245cce80dc9fe2847d4
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	T Technology (General)
spellingShingle	T Technology (General) Bahar, N. D. Marimuthu, S. Yahya, W. J. Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
description	This paper studies the influence of Nd:YAG (neodymium-doped yttrium aluminium garnet) laser process parameters on laser drilled hole quality. Ti-6Al-4V of 1 mm and 3 mm thickness were used as the workpiece substrate. The principal findings are mainly based on minimising the taper angle in laser drilled holes, reducing the heat affected zone and reducing the production of spatter. Identification of key process variables associated with laser drilling process is accomplished by trial experimentation. Using the identified key process variables, further experiments were then performed with the assistance of statistical design of experiment (DOE) to find the interaction and individual effects of various laser process parameters on laser drilled hole quality. The lowest taper angle of 1.8 degrees was achieved with use of nitrogen as the assist gas. Furthermore, from the laser process observations, it was found that laser power significantly affects the quality of the laser drilled hole. Increase in laser power would increase the hole size and result in more spatter on the entry hole surfaces. The nozzle focus position substantially influenced the laser drilled hole size. The amount of spatter deposits increased with decrease in the nozzle offset. Increase in laser frequency significantly increased the exit diameter, which resulted in smaller taper angle. Number of pulse required to drill through a workpiece depends on the material properties and physical properties of the material. For 1mm Ti-6Al-4V, a minimum of two pulses was required to successfully removed the material during drilling and a minimum of 4 pulses was required to drill through the same material with 3mm thickness.
format	Conference or Workshop Item
author	Bahar, N. D. Marimuthu, S. Yahya, W. J.
author_facet	Bahar, N. D. Marimuthu, S. Yahya, W. J.
author_sort	Bahar, N. D.
title	Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
title_short	Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
title_full	Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
title_fullStr	Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
title_full_unstemmed	Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)
title_sort	pulsed nd: yag laser drilling of aerospace materials (ti-6al-4v)
publisher	Institute of Physics Publishing
publishDate	2016
url	http://eprints.utm.my/id/eprint/72978/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84998880803&doi=10.1088%2f1757-899X%2f152%2f1%2f012056&partnerID=40&md5=9f68797ee6d56245cce80dc9fe2847d4
_version_	1643656542219665408
score	13.211869

Pulsed Nd: YAG laser drilling of aerospace materials (Ti-6Al-4V)

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