Loading...

Prediction of solidification behaviour of weld pool through modelling of heat transfer and fluid flow during gas tungsten arc welding of commercial pure aluminium

Farzadi, A ; Sharif University of Technology | 2008

921 Viewed
  1. Type of Document: Article
  2. DOI: 10.1179/174328407X248532
  3. Publisher: 2008
  4. Abstract:
  5. A mathematical model is developed to assess the solidification behaviour of the weld pools. To do so, during gas tungsten arc welding of commercial pure aluminium, equations of conversation of mass, energy and momentum are numerically solved considering three-dimensional steady state heat transfer and fluid flow conditions. The weld pool geometry, weld thermal cycles and various solidification parameters are calculated using temperature and velocity fields acquiring from the utilised model. The solidification behaviour of the weld pool at the weld centreline and the fusion line is then studied using the solidification parameters including temperature gradient G, solidification rate R and the combined forms G/R and GR. In order to verify the predictions, welding experiments are performed and geometry of the weld fusion zone is measured. The calculated geometry of the weld fusion zone is found to be in good agreement with the corresponding experimental result. The predictions show that the cooling rate GR increases toward the centreline while the other solidification parameter G/R shows a different behaviour. In addition, it is found that under the employed welding conditions, as the welding speed increases temperature gradients both at the weld centreline and at the fusion line are reduced. © 2008 Institute of Materials, Minerals and Mining
  6. Keywords:
  7. Cavity resonators ; Cooling ; Crystallization ; Electric arc welding ; Electric welding ; Equations of state ; Flow of fluids ; Forecasting ; Fusion reactions ; Gas metal arc welding ; Heat exchangers ; Heat transfer ; Heating equipment ; Lakes ; Mathematical models ; Solidification ; Temperature sensors ; Thermal gradients ; Thermoanalysis ; Three dimensional ; Tungsten ; Welds ; Commercial pure aluminiums ; Cooling rates ; Fluid flow ; Fluid flow conditions ; Fluid flows ; Fusion lines ; Gas tungsten arc welding ; Gas Tungsten arcs ; Mathematical modelling ; Solidification behaviours ; Solidification parameters ; Solidification rates ; Steady states ; Temperature gradients ; Velocity fields ; Weld fusion zones ; Weld pool geometries ; Weld pools ; Weld thermal cycles ; Welding conditions ; Welding speeds ; Welding
  8. Source: Materials Science and Technology ; Volume 24, Issue 12 , 2008 , Pages 1427-1432 ; 02670836 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1179/174328407X248532