Effects of electromagnetic force on melt flow and weld shape in laser keyhole welding

Jun Zhou, Hai Lung Tsai, Pei Chung Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The use of electromagnetic force to stir molten metal in some casting processes was reported long ago. Recently, it has been demonstrated that by applying an external magnetic field along with or without an external electric current, the melt flow in the weld pool can be influenced leading to the change of weld shape in both CO2 and Nd:YAG welding of aluminium alloys with or without filler metal. However, so far these very limited studies are based on experiments and no theoretical explanations are given. Hence, there is a strong need to fundamentally understand how the electromagnetic force is affecting the melt flow and the resulting weld pool shape. This would provide a foundation to optimize and control process parameters in order to achieve the desired weld pool shape. In this paper, mathematical models and the associated numerical techniques have been developed to systematically investigate the effects of electromagnetic force in laser keyhole welding. The transient weld pool fluid flow and the shape of the solidified weld are calculated under various electromagnetic conditions for both spot and 3-D moving laser welding. The parameters studied include the magnitude, duration, and direction of the electrometric force, welding speed, and the time when electromagnetic force is applied, etc. In addition, the feasibilities of using electromagnetic force to eliminate porosity formation and to modify weld bead surface smoothness are conducted. Computer animations showing the fluid flow and weld pool dynamics, and how the electromagnetic force influences the melt flow behaviors will be shown in the presentation.

Original languageEnglish (US)
Title of host publicationICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
PublisherLaser Institute of America
ISBN (Print)0912035773, 9780912035772
DOIs
StatePublished - 2004
EventICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States
Duration: Oct 4 2004Oct 7 2004

Publication series

NameICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings

Other

OtherICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CitySan Francisco, CA
Period10/4/0410/7/04

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Electrical and Electronic Engineering

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  • Cite this

    Zhou, J., Tsai, H. L., & Wang, P. C. (2004). Effects of electromagnetic force on melt flow and weld shape in laser keyhole welding. In ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings (ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings). Laser Institute of America. https://doi.org/10.2351/1.5060299