The submitted paper deals with laser welding of aluminium alloys with the application of the computer support in the welding process. Currently, laser welding represents one of the most common processes as it allows accepting of high quality welds with minimal thermal zone in case of diverse materials such as steel, high-strength steel, aluminium or titanium. The use of computer support for the company is also very important in the welding process. To produce a successful product every modern company must use new methods of production control and monitoring such as modelling, simulations, information processing and quality control [Mascenik 2014]. This paper points out an application of computer support in the laser welding sphere, i.e. laser welding of aluminium alloys. At the same time the paper specifies aluminium alloys and points to determination of stress and estimate of the weld deformation by means of simulation in the program of SOLIDWORKS.