关键词: 钨极惰性气体保护焊, 焊接电弧, 数字孪生, 焊接过程, 数值模拟

Abstract: Aiming at the limitations of insufficient real-time boundary data and inaccurate construction of simulation models in the traditional numerical simulation method for the welding arc,the PyFluent co-simulation technology was utilized to develop a digital twin model of transient Tungsten Inert Gas arc welding(TIG)driven by real-time electrical signal data and the complicated mechanism model.The TIG welding arc twinning mechanism module was developed based on the Magneto Hydrodynamic(MHD)theory.The PyFluent solution strategy was developed to integrate real-time electrical signal data and the twin mechanism module,and the dynamic development rules for arc temperature and current density was acquired in the welding process.The high fidelity of the digital twin model was verified through the comparative analysis of physical and virtual data.The experimental verification showed that the digital twin model test results were consistent with the experiment arc shape;the TIG welding arc digital twin model driven by real-time electrical signal data and mechanism model could realize high-fidelity mapping of transient welding arcs,which presented a new approach for studying the evolutionary behavior of the welding arc.

Key words: tungsten inert gas arc welding, welding arc, digital twin, welding process, numerical simulation