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Welding practice has traditionally been treated as an art and in most cases experience based trial‐and‐error experimentation has been the major approach to establish a feasible welding procedure. In recent years, significant progress has been made in understanding welding phenomena based on numerical modeling. Recent modeling efforts include simulation of the weld pool formation, weld microstructure evolution, and welding induced residual stress and distortion. The numerical models based on interdisciplinary applied sciences (e.g. heat transfer and fluid flow, materials science, mechanical engineering, and fracture mechanics) have provided detailed insights into welding process and guidance in design of high performance welded‐joints and cost effective welding process. The concept of “Virtual Welding,” which is a simulation package based on interdisciplinary applied science and multi‐scale numerical models, is proposed in this paper. Examples are provided to demonstrate the applications of “Virtual Weldin...