Abstract
To date, several numerical models representing the tungsten inert gas (TIG) arc are available. However, little has been done on testing the reliability of these models for parameter values differing from the ones used in the respective papers. This paper deals with the comparison of measured arc welding data provided by E. Siewert from Linde AG and the results of the two most common arc and cathode sheath models. These models make different degrees of simplification of the actual processes in the arc, especially the cathode sheath. Different shapes of the electrodes, different welding currents and shielding gases are taken into account as well as the resolution of the numerical grid on which the calculations are carried out. The findings of this paper are used to show when a simplified approach still leads to valid results and when more sophisticated models have to be used.
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