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U ovom završnom radu ukratko je opisana osnovna oprema MAG postupka zavarivanja te načini prijenosa metala. Opisana je uloga dodatnog materijala te su nabrojane različite vrste dodatnih materijala. Detaljno je opisano zavarivanje metalnim praškom punjenom žicom, njegove prednosti i mane, način proizvodnje metalnim praškom punjene žice, te usporedba parametara zavarivanja metalnim praškom punjenom žicom i punom žicom. Nabrojane su i opisane komponente zaštitnih plinova i njihove dvokomponentne i trokomponentne mješavine. Navedene su prednosti zavarivanja Ar-CO2-O2 mješavinama plinova u odnosu na Ar-CO2 mješavine plinova. Također je opisano robotizirano zavarivanje, načini programiranja robota i zahtjevi za robotizaciju MAG postupka zavarivanja. U eksperimentalnom dijelu provedeno je robotizirano zavarivanje metalnim praškom punjenom žicom uz primjenu Ar-CO2-O2 zaštitnih mješavina plinova na tri uzorka čelika kvalitete S355J2+N. Debljina stijenke jednog uzorka je 20 mm, a ostala dva uzorka su debljine stijenke 5 mm. Na temelju dobivenih rezultata ispitivanja, analizirana je geometrija zavarenog spoja i makrostruktura spoja. This bachelor's thesis briefly describes the basic equipment for MAG welding process and the modes of metal transfer. It also covers the role of additional material and different types of additional materials which can be used. Main topic of this thesis is metal core arc welding, its advantages and disadvantages, the production method of metal cored wire, and a comparison of welding parameters for metal cored arc welding and solid wire welding. Shielding gas components and their binary and ternary gas mixtures are listed and described in detail. The advantages of welding with Ar-CO2-O2 gas mixtures compared to Ar-CO2 mixtures are also covered. In addition, robotic welding, robot programming methods and requirements for MAG welding robotization are also explained. In the experimental part, robotized welding with metal cored wire and the application of Ar–CO2–O2 shielding gas mixtures was performed on three samples of S355J2+N grade steel. The wall thickness of one sample is 20 mm, while the other two samples have a wall thickness of 5 mm. Based on the obtained test results, welded joint geometry and macrostructure of the welded joint were analyzed. |
