Simulation-based training for welders is continuously gaining importance. However, research on the integration of welding simulators into existing structures and processes is still scarce. In order to contribute towards a greater understanding, this paper collects concepts from areas with a long history of simulation-based training, such as medicine and aviation. These concepts are applied to provide a structured evaluation of two case studies that were conducted within two pioneer organisations. It was observed that certain levels of physical and functional fidelity were necessary for experienced trainers to accept welding simulators. Currently, the expected features are best provided by welding simulators based on augmented reality. Optimal results were yield in groups of 3-4 trainees, when every trainee is engaged into the simulation with a certain role (welding, correcting, filming, taking notes). Simulation-based training can be successfully applied towards a range of skills that includes technical and functional expertise training, problem-solving and decision-making skills, as well as interpersonal and communications skills.