The electric arc is widely-used for welding and cutting of metals. The knowledge of the plasma and shielding gas flow as well as its interaction with the electric arc and the energy transport in the workpiece is essential for optimizing torches and the welding and cutting process. For the simulation of electric arcs the commercial computational fluid dynamics code Ansys CFX can be used. Additionally a MHD model for calculation of the electromagnetic effects and large datasets of the plasma gas properties have to be implemented. By explaining the solution of a simulated hand-guided torch for plasma-welding the influence of process parameters, shielding gas properties and nozzle design is presented. 1
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