The paper objective is to study a hybrid welding process based on the combination of two methods: laser and plasma ones. The combination of two different types of welding is a promising way to detect and then eliminate the defects of each of them. The task to which the paper is devoted is aimed at finding out features when combining different approaches to the creation of fixed welded joints. The paper analyzes hybridization of laser and plasma piles in a concise way, provides generalized information about their main advantages and disadvantages. The distinctive novelty of this work is concise and cumulative analysis of the problem involved which has not been done before. The result of the study is the publication of the hybrid welding feature, explaining the principles of the working process of the devices. On the basis of the conducted research, the following conclusions can be drawn: hybridization of laser and plasma welding compensate for the disadvantages and increase the advantages of each other; during the study, the main pros and cons are summarized, important aspects of each of the affected methods for obtaining fixed welded joints are analyzed.

The study objective is the possibility of thrust augmentation of a turbojet engine due to upgrading the nozzle cluster by installing an external duct of the annular combustor on the engine case, acting as a nozzle. The problem to which the article is devoted is to get a new product with higher operating parameters at minimal cost by upgrading a mass-produced engine. The novelty of the work is in the introduction of an annular combustor into existing engines that are in serial production, thereby reducing the cost of producing a completely new product with greater thrust. During the research, a number of theoretical advantages of a new product based on a mass-produced engine are obtained, including increased thrust with minimal change in its weight, as well as the economic benefits of producing such units with minimal production changeover. At the stage of theoretical research of this topic, a retrofitted engine with an annular combustor has a number of advantages over the standard engine taken as a basis.