International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A methodology for thermal analysis of the operation of transistors in a welding inverter is proposed. The results for heating of the transistors obtained by numerical modelling using the finite element method (FEM) are presented. A thermal problem has been solved taking into account the forced movement of air. Based on the obtained solutions, the maximum temperatures on the surface of the heat sink and in the crystal of the field-effect transistor are presented, depending on the speed of air movement and the temperature of the environment in continuous mode of operation of the power source. The presented analysis is applicable to select appropriate heat sink and fan. Results are useable during design of the power source oriented to wire arc additive manufacturing.

An experimental study of the formation of beads during the Wire and Arc Additive was carried out. The experiments were carried out in the low energy range of the welding arc. The influence of the wire feeding rate and traverse speed, their ratio and the heat input on the width and height of the resulting layers was monitored. Correlation coefficients were calculated between the linear energy and the ratio of the feed rate to the traverse speed on the one hand and the geometric dimensions of the layers on the other. It is shown that, in the studied range of technological parameters, the heat input is more strongly related to the geometric dimensions than the ratio of the velocities of wire feeding and deposition.

Wire and arc additive manufacturing is a rapidly developing technology for the production of metal parts used in various industries such us space, automotive, shipbuilding, etc. Today, it is a potential alternative to traditional manufacturing processes due to its shorter lead time, low material losses and cost-effectiveness. In recent decades, this technology has been used to produce components from various materials. This overview examines the methods of realization, the specifics of the technological process, the process parameters and their influence on the formation of the layers and typical.