Systematic study of effect of cross-drafts and nozzle diameter on shield gas coverage

V. Beyer, Stuart Campbell, Gemma Ramsey, Alexander Galloway, A.J. Moore, Norman McPherson

Research output: Contribution to journalArticle

6 Citations (Scopus)
183 Downloads (Pure)

Abstract

A shield gas flow rate of 15–20 L min21 is typically specified in metal inert gas welding, but is often adjusted to as high as 36 L min21 by welders in practice. Not only is this overuse of shield gas wasteful, but uncontrolled high gas flows can lead to significant turbulence induced porosity in the final weld. There is therefore a need to understand and control the minimum shield gas flow rate used in practical welding where cross-drafts may affect the coverage. Very low gas coverage or no shielding leads to porosity and spatter development in the weld region. A systematic study is reported of the weld quality achieved for a range of shield gas flow rates, cross-draft speeds and nozzle diameters using optical visualisation and numerical modelling to determine the shield gas coverage. As a consequence of the study, the shield gas flow has been
reduced to 12 L min21 in production welding, representing a significant process cost saving and reduced environmental impact with no compromise to the final weld quality.
Original languageEnglish
Pages (from-to)652-660
Number of pages9
JournalScience and Technology of Welding and Joining
Volume18
Issue number8
DOIs
Publication statusPublished - Nov 2013

Keywords

  • MIG
  • CFD
  • gas shielding
  • shadowgraphy
  • porosity

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