The modeling of the heat source in TIG welding may take different forms, ranging from surface heat flux with uniform or Gaussian distribution, to volumetric heat distribution with complex shapes such as a double ellipsoid. Once the mathematical model for the heat source is chosen for a given steady state calculation, an efficiency parameter η is fitted to adjust the simulated temperatures considering the measured ones, on some points of the surface plate. It is shown here that the way in which the heat flux density is spread (at the surface or in volume) has limited impact on the results of the macroscopic thermo-mechanical simulation, if the total input energy ηUI is kept constant.

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