|Title:||Laser welding of metal matrix composite materials|
Hong Kong Polytechnic University -- Dissertations
|Pages:||x, 105 p. : ill. ; 30 cm|
|Abstract:||Metal matrix composites ( MMCs ) using particulate or whisker reinforcement have considerable potential for providing lightweight components exhibiting high strength, high stiffness, good wear resistance and improved elevated temperature properties compared to the matrix alloys. However, the joining as well as the welding problem of these materials limited their applications in automobile, marine, precision engineering and transportation industries. Laser welding has been considered as an non-conventional and a promising process for the joining of MMC materials. In this dissertation, laser lap joint welding of an aluminium based metal matrix composite was investigated using a pulsed Nd:YAG laser.. The results showed that pulsed Nd:YAG laser welding techniques could be used to join Al/SiCp metal matrix composites. The threshold intensity model of welding could be employed to predict the depth of penetration as well as the weld profile. Microstructural examination showed that brittle aluminium carbides were formed in the Fusion Zone which were harmful to mechanical properties of the material. However, proper control of the laser welding was possible to avoid excessive and large carbides formation. Defects such as cracking and porosity were found in the welding, but welding under the optimum conditions the amount of defects could be greatly reduced.|
Files in This Item:
|b12349501.pdf||For All Users (off-campus access for PolyU Staff & Students only)||4.69 MB||Adobe PDF||View/Open|
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item: