Modelling magnetohydrodynamics to investigate variation of shielding gases on arc characteristics in the GTAW process

Stuart Campbell, Alexander Galloway, Norman McPherson, Duncan Camilleri, Daniel Micallef

Research output: Contribution to conferencePaper

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Abstract

Gas tungsten arc welding requires a gas shield to be present in order to protect the arc area from contamination by atmospheric gases. As a result of each gas having its own unique thermophysical properties, the shielding gas selected can have a major influence on the arc stability, welding speed, weld appearance
and geometry, mechanical properties and fume generation.
Alternating shielding gases is a relatively new method of discreetly supplying two different shielding gases to the welding region in order to take advantage of the beneficial properties of each gas, as well as the inherent pulsing effects generated. As part of an ongoing process to fully evaluate the effects of this novel supply method, a computational fluid dynamics model has been generated to include the gas dependent thermodynamic and transport properties in order to evaluate the effects that an alternating gas supply has on the arc plasma. Experimental trials have also been conducted to validate the model arc profile predictions.
Original languageEnglish
Number of pages1
Publication statusPublished - 7 Aug 2014
EventInternational Conference on Materials and Product Technology, ICMPT14 - Loden Hotel, Vancouver, Canada
Duration: 7 Aug 20148 Aug 2014
http://www.waset.org/conference/2014/08/vancouver/ICMPT

Conference

ConferenceInternational Conference on Materials and Product Technology, ICMPT14
CountryCanada
CityVancouver
Period7/08/148/08/14
Internet address

Keywords

  • alternating shielding gases
  • ANSYS CFX
  • ags tungsten arc welding (GTAW)
  • magnetohydrodynamics (MHD)

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