Combined effects of temperature field and ultrasonic vibration on bubble motion in laser joining of plastic to metal

Yujiao Chen, Tai Man Yue, Zhongning Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

A previous study has found that applying ultrasonic vibration in laser joining of Polyethylene terephthalate (PET) plastic to Ti metal can greatly reduce bubbles formed in the joint. In this study, the theoretical basis on the combined effects of pressure and temperature fields on the trajectory of bubbles was analyzed using finite element simulation. A non-uniform temperature field influences the evaporation momentum pressure acting on a bubble, causing it to travel from a low to a high temperature region. A properly designed ultrasonic transducer tool, however, can create an unbalanced pressure field around a bubble. Under the combined effects of these elements, bubbles in the molten pool can be made to escape from the joint. The predicted results and obtained experimental outcomes matched well, which were also supported by the evidence of captured high-speed camera images.
Original languageEnglish
Article number116846
JournalJournal of Materials Processing Technology
Volume288
DOIs
Publication statusPublished - Feb 2021

Keywords

  • Laser joining
  • Ultrasonic vibration
  • Bubble movement
  • Temperature field
  • Pressure field

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