Modeling of transport phenomena in hybrid laser-MIG keyhole welding

J. Zhou, H. L. Tsai

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

Mathematical models and associated numerical techniques have been developed to investigate the complicated transport phenomena in spot hybrid laser-MIG keyhole welding. A continuum formulation is used to handle solid phase, liquid phase, and the mushy zone during the melting and solidification processes. The volume of fluid (VOF) method is employed to handle free surfaces, and the enthalpy method is used for latent heat. Dynamics of weld pool fluid flow, energy transfer in keyhole plasma and weld pool, and interactions between droplets and weld pool are calculated as a function of time. The effect of droplet size on mixing and solidification is investigated. It is found that weld pool dynamics, cooling rate, and final weld bead geometry are strongly affected by the impingement process of the droplets in hybrid laser-MIG welding. Also, compositional homogeneity of the weld pool is determined by the competition between the rate of mixing and the rate of solidification.

Original languageEnglish (US)
Pages (from-to)4353-4366
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
Volume51
Issue number17-18
DOIs
StatePublished - Aug 1 2008

Fingerprint

welding
solidification
Welding
Welds
Lasers
mushy zones
lasers
Solidification
laser welding
impingement
latent heat
beads
fluid flow
homogeneity
solid phases
mathematical models
liquid phases
enthalpy
energy transfer
melting

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "Mathematical models and associated numerical techniques have been developed to investigate the complicated transport phenomena in spot hybrid laser-MIG keyhole welding. A continuum formulation is used to handle solid phase, liquid phase, and the mushy zone during the melting and solidification processes. The volume of fluid (VOF) method is employed to handle free surfaces, and the enthalpy method is used for latent heat. Dynamics of weld pool fluid flow, energy transfer in keyhole plasma and weld pool, and interactions between droplets and weld pool are calculated as a function of time. The effect of droplet size on mixing and solidification is investigated. It is found that weld pool dynamics, cooling rate, and final weld bead geometry are strongly affected by the impingement process of the droplets in hybrid laser-MIG welding. Also, compositional homogeneity of the weld pool is determined by the competition between the rate of mixing and the rate of solidification.",
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Modeling of transport phenomena in hybrid laser-MIG keyhole welding. / Zhou, J.; Tsai, H. L.

In: International Journal of Heat and Mass Transfer, Vol. 51, No. 17-18, 01.08.2008, p. 4353-4366.

Research output: Contribution to journalArticle

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