Nowadays, the use of additive manufacturing technologies is becoming more and more frequent. Additive manufacturing technologies enable the production of complex products in a short time, with a low consumption of materials, which greatly decreases the production costs. A considerable advantage of additive manufacturing technologies are accuracy and repeatability, which are both crucial in the modern industry. In the practical part of the paper, we used the CMT wire arc additive manufacturing process. The main aim of the paper was to conduct an analysis of weld interpass temperatures in wire arc additive manufacturing of CuA18 alloy. We determined that the starting temperature of welding must not exceed 260 °C. If the temperature is higher, the welding joints can spill. On the other hand, the temperature must not be lower than 230 °C, in which case the welding build-ups are not formed appropriately. What is more, in case of excessive energy input, the weld heats too much, which negatively impacts the quality of the welding joint. An excessive energy input occurs if the starting temperature of the additive manufacturing is above 260 °C and if the speed of additive manufacturing is equal to 4 mm/s or less.
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