Problems of welding in shipbuilding - an analytic-numerical assessment of the thermal cycle in haz with three dimensional heat source models in agreement with modelling rules

At the beginning of this paper a short characteristic of the methodology of classic Rosenthal-Rykalin solution of temperature distribution during welding is provided. In the further part, the requirements concerning process modelling were presented, particularly with thermal processes taken into consideration. Finally, the Cylindrical-Involution-Normal and Double-Ellipsoidal heat source models are presented.