Numerical analyses of production processes have proved useful and capable of obtaining significant savings. However, properly conducted simulations of technological processes require not only the appropriate adjustment of parameters, boundary conditions etc., but also need detailed input data in the form of databases of material properties. The input data mentioned above are decisive for the future conformity of results obtained in numerical simulations with results of actual welding or heat processing. This article, being the continuation of the cycle of information dedicated to numerical analyses of welding and heat treatment processes, presents possible variants of numerical analyses of these processes and exemplary stages of preparation of simulations as well as results of such simulations.