In this thesis, the topic of A-TIG welding of stainless steels is covered, along with an overview of the properties, classification, and applications of stainless steels. The aim of the study is to determine how the application of an activation coating affects the productivity of the TIG welding process for stainless steels. The theoretical part describes the main types of stainless steels and their characteristics. Over two chapters, conventional TIG and A-TIG welding technologies are explained in more detail, including their parameters, execution methods, and required equipment. In the experimental part, conducted in the laboratory of the University North, the welding process was carried out on stainless steel samples using both TIG methods. After welding, the properties of the samples were tested, and the analysis of the results led to the conclusion that the A-TIG process allows deeper penetration if performed correctly.