Microstructure and mechanical properties of wire and arc additive manufactured inconel 625 alloy

U ovome je radu opisan postupak aditivne proizvodnje električnim lukom i žicom te je detaljnije obrađeno MAG zavarivanje i prikladni modaliteti prijenosa metala u električnom luku. Navedene su osnovne karakteristike legure Inconel 625 te primjene iste u industrijskoj praksi. Dan je poseban naglasak na problematiku zavarljivosti i promjenu mikrostrukture u području zavarenog spoja. U eksperimentalnom dijelu rada određeno je optimalno područje parametara s ciljem postizanja maksimalne produktivnosti pri aditivnoj proizvodnji električnim lukom i žicom legure Inconel 625. Područje parametara određeno je za dva zaštitna plina, Argon 5.0 i Inoxline H5. Na izrađenim uzorcima provedeno je radiografsko ispitivanje, ispitana je i analizirana mikrostruktura te su provedena mehanička ispitivanja, mjerenje tvrdoće i statički vlačni pokus. Dobiveni podaci su analizirani te je donesen zaključak o utjecaju parametara zavarivanja na mikrostrukturu i mehanička svojstva zidova izrađenih WAAM postupkom.In this thesis is described the procedure for Wire and Arc Additive Manufacture, MAG welding and appropriate transmission modes of the metal in the electric arc. The basic characteristics of the Inconel 625 alloy are listed and application of this material in industrial practice. A special focus on the weldability of this material is given, and also the change of the microstructure in the welded joint. In the experimental part of this thesis, the optimal range of parameters was determined with the aim of achieving maximum productivity of Wire and Arc Additive Manufacture of the Inconel 625 alloy. The range of parameters was determined for two shielding gases, Argon 5.0 and Inoxline H5. On the welded specimens radiography was performed, microstructure is analyzed and mechanical tests, hardness measurement and static tensile test were also performed. The obtained data were analyzed and conclusions on the influence of welding parameters on the microstructure and the mechanical properties of the welded walls are given