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Title: Fatigue behaviour of titanium/PET joints formed by ultrasound-aided laser welding
Authors: Chen, YJ 
Yue, TM 
Guo, ZN
Keywords: Fatigue behaviour
Laser joining
Polyethylene terephthalate
Ultrasonic vibration
Issue Date: 2018
Publisher: Elsevier Ltd
Source: Journal of manufacturing processes, 2018, v. 31, p. 356-363 How to cite?
Journal: Journal of manufacturing processes 
Abstract: The fatigue properties of metal/plastic hybrid joints are an important engineering consideration. There are only few studies on this subject are available, but none was found on studying the fatigue behaviour of laser welded metal/plastic joints. The objective of this study is to characterise and to compare the fatigue performance, in terms of S-N data, of the lap joined Ti/PET hybrid specimens produced by laser welding with and without ultrasound aiding. The fatigue resistance, in terms of S-N data, of the joints formed with the aid of ultrasound was always higher than that of those joints produced without using ultrasound, and the improvement was at least one order of magnitude higher when compared to the same laser processing condition. The fatigue resistance of these two kinds of joints can be explained by the proposed fatigue crack propagation paths, which are closely associated to the porosity in the joint zone and the chemical bonding at the joint interface. For the specimens formed with the aid of ultrasound, a stronger chemically bonded joint interface was obtained, and this increases the fatigue life of the joint. With a similar chemical bonding nature, an improvement of fatigue life of one order of magnitude was attained when porosity was eliminated from the joint zone.
ISSN: 1526-6125
EISSN: 2212-4616
DOI: 10.1016/j.jmapro.2017.11.027
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