Mechanisms of cracking in laser welding of magnesium alloy AZ91D
Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead‐on‐plate laser welding of AZ91D, even though bead‐on‐plate weldin...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/153909 |
| _version_ | 1826111769194528768 |
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| author | Zhou, Wei Aprilia, A. Mark, Chee Kong |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zhou, Wei Aprilia, A. Mark, Chee Kong |
| author_sort | Zhou, Wei |
| collection | NTU |
| description | Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead‐on‐plate laser welding of AZ91D, even though bead‐on‐plate welding is required for the repair of cast AZ91D parts with surface defects. In the present investigation, surface cracking of the weld metal was observed when an AZ91D magnesium alloy was bead‐on‐plate welded using the laser welding method. This paper presents the experimental results and analyses to show that the cracking is “solidification cracking” initiated from the weld surface under high thermal stresses. This is in contrast to the “liquation cracking” observed in heat affected zones in tungsten inert gas welding of the same magnesium alloy. Laser power was found to be one of the main factors affecting the distance of the crack propagation. The higher laser power resulted in longer crack propagation distance into the weld metal. It is demonstrated that hot cracking could be avoided by lowering the laser power and welding speed. |
| first_indexed | 2024-10-01T02:55:54Z |
| format | Journal Article |
| id | ntu-10356/153909 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:55:54Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1539092022-01-07T05:21:40Z Mechanisms of cracking in laser welding of magnesium alloy AZ91D Zhou, Wei Aprilia, A. Mark, Chee Kong School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Magnesium Alloy Laser Welding Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead‐on‐plate laser welding of AZ91D, even though bead‐on‐plate welding is required for the repair of cast AZ91D parts with surface defects. In the present investigation, surface cracking of the weld metal was observed when an AZ91D magnesium alloy was bead‐on‐plate welded using the laser welding method. This paper presents the experimental results and analyses to show that the cracking is “solidification cracking” initiated from the weld surface under high thermal stresses. This is in contrast to the “liquation cracking” observed in heat affected zones in tungsten inert gas welding of the same magnesium alloy. Laser power was found to be one of the main factors affecting the distance of the crack propagation. The higher laser power resulted in longer crack propagation distance into the weld metal. It is demonstrated that hot cracking could be avoided by lowering the laser power and welding speed. Published version This research was funded by Majestic Rock Resources Group Pte. Ltd. through award #020866-00001. 2022-01-07T05:21:40Z 2022-01-07T05:21:40Z 2021 Journal Article Zhou, W., Aprilia, A. & Mark, C. K. (2021). Mechanisms of cracking in laser welding of magnesium alloy AZ91D. Metals, 11(7), 1127-. https://dx.doi.org/10.3390/met11071127 2075-4701 https://hdl.handle.net/10356/153909 10.3390/met11071127 2-s2.0-85110159907 7 11 1127 en #020866-00001 Metals © 2021 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). application/pdf |
| spellingShingle | Engineering::Mechanical engineering Magnesium Alloy Laser Welding Zhou, Wei Aprilia, A. Mark, Chee Kong Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title | Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title_full | Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title_fullStr | Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title_full_unstemmed | Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title_short | Mechanisms of cracking in laser welding of magnesium alloy AZ91D |
| title_sort | mechanisms of cracking in laser welding of magnesium alloy az91d |
| topic | Engineering::Mechanical engineering Magnesium Alloy Laser Welding |
| url | https://hdl.handle.net/10356/153909 |
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