Effect of shielding gas parameters on weld metal thermal properties in gas metal arc welding

F.H. Ley, Stuart Campbell, Alexander Galloway, Norman McPherson

Research output: Contribution to journalArticle

18 Citations (Scopus)
424 Downloads (Pure)

Abstract

This study considered the effect of shielding gas parameters (composition, supply method and flow rate) on the post weld thermal properties (thermal expansion, specific heat capacity, thermal diffusivity and thermal conductivity) of the weld metal in gas metal arc welding. This is of importance as the thermal properties influences the temperature distribution and therefore the residual stresses and distortion present within the final structure. Due to the lack of accurate thermal data, computational modelling techniques (such as FEA, CFD, etc.) used for modelling the welding process generally make assumptions regarding the material thermal properties, and it is often the case that the parent material thermal properties are extended to the weld metal, introducing errors to the simulation.
It was determined that the weld metal posses considerably different thermal properties to the DH36 grade steel parent material, and that the shielding gas parameters significantly alter key thermal properties of the solidified weld metal. A lower shielding gas flow rate exhibited beneficial properties including a lower thermal expansion, and higher specific heat capacity and thermal conductivity than a higher shielding gas flow rate.
Original languageEnglish
Pages (from-to)1213-1221
Number of pages9
JournalInternational Journal of Advanced Manufacturing Technology
Volume80
Issue number5
Early online date16 Apr 2015
DOIs
Publication statusPublished - Sep 2015

Keywords

  • GMAW
  • weld metal thermal properties
  • thermal expansion
  • specific heat
  • thermal diffusivity
  • thermal conductivity

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