The first part of the article presents an overview of software programmes assisting welding-related engineering works as well as discusses possibilities and advantages related to the use of such programmes. Software programmes available today enable, among other things, the monitoring of welding processes, calculations of temperature distribution, the determination of mechanical and plastic properties, simulations of distributions of residual stresses as well as simulations of transformations triggered by welding thermal cycles. The second part of the article is dedicated to simulators enabling physical simulations of welding processes as well as describes principles of simulations tests and presents advantages related to the use of this technique.