This paper presents the technical specification of a laser welding machine, which main purpose is the weld of thin aluminium sheets. With the application of laser machines in automotive, aerospace, and other industries, it has become of crucial importance for a company working in those fields to keep updated with the technological progress. In this thesis, a deep research in laser machines and its applications has been done. The primary objective of this thesis is to gather knowledge about laser machines to help our client to find the machines they need. Among the several types of machines, the difference in the choice relied on which main type of industrial laser should be used: carbon dioxide (CO2) or neodymium-doped yttrium aluminium garnet (Nd: YAG). The second objective of this thesis is to find the best way to demand those machines to the procurers: to give detailed specifications to the procurers, or to give them just guidelines on what the machine must have and should have. The key results obtained from the research were that laser source to use is the Nd: YAG and that the most appropriate shielding gas is Argon. Therefore, in conclusion, the specifications stated in the table will help our client to acquire the laser machine they demand; as well as spending the money efficiently.