Fatigue behaviour of titanium/PET joints formed by ultrasound-aided laser welding

Y. J. Chen, Tai Man Yue, Z. N. Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)356-363
Number of pages8
JournalJournal of Manufacturing Processes
Publication statusPublished - 1 Jan 2018


  • Fatigue behaviour
  • Laser joining
  • Polyethylene terephthalate
  • Titanium
  • Ultrasonic vibration

ASJC Scopus subject areas

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering

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