Optimization of welding technology on aluminium alloy 6082-T6 with AC MIG process

Tema ovog diplomskog rada je optimizacija tehnologije zavarivanja aluminijske legure 6082-T6 postupkom AC MIG. Rad je podijeljen u dva dijela, a to su teorijski i eksperimentalni dio. U teorijskom dijelu rada općenito je prikazan povijesni razvoj aluminija. Navedena su svojstva, podjela i primjena aluminija i njegovih legura. Obrađena je tema vezana uz zavarljivost aluminija i mogućih problema koji se pojavljuju prilikom zavarivanja. Prikazane su posljedice prevelikog unosa topline i neodgovarajuće tehnike rada. Opisane su značajke AC MIG postupka zavarivanja te je prikazana usporedba s konvencionalnim MIG postupkom. U eksperimentalnom dijelu je za odgovarajuće debljine osnovnog materijala odabrana prikladna tehnologija zavarivanja aluminijske legure 6082-T6 uz minimalan unos topline za sučeljene spojeve. Definirana je geometrija pripreme kao i maksimalna međuprolazna temperatura. Provedeno je zavarivanje radnih komada pomoću AC MIG postupka zavarivanja uz mehanizirano gibanje i primjenu zaštitnog plina argona. Na zavarenim uzorcima provedena su mehanička ispitivanja sukladno HRN EN ISO 15614-2 normi. Zaključno je definirana optimalna tehnologija AC MIG zavarivanja sa stanovišta geometrije i mehaničkih svojstava spoja. Nakon analize teorijskog i eksperimentalnog dijela donesen je zaključak.The topic of this master thesis is optimization of welding technology on aluminium alloy 6082-T6 with AC MIG process. The paper is divided into two parts, the first part is theoretical and the second is experimental. In the theoretical part, the historical development of aluminium is presented in general. The properties, division, and application of aluminium and its alloys are listed. The topic related to the weldability of aluminium and the possible problems that arise during welding was discussed. The consequences of excessive heat intake and inappropriate work techniques are shown. The features of the AC MIG welding process are described and a comparison with the conventional MIG process is presented. In the experimental part, suitable welding technology of aluminum alloy 6082-T6 with minimal heat input for butt joints was chosen for the appropriate thicknesses of the base material. The geometry of the preparation as well as the maximum interpass temperature were defined. The welding of workpieces was carried out using the AC MIG welding process with mechanized motion and the use of shielding argon gas. Welded joints were tested, and the results were analyzed according to the HRN EN ISO 15614-2 standard. In conclusion, the optimal AC MIG welding technology is defined from the point of view of the geometry and mechanical properties of the joints. After considering the theoretical and experimental parts, the test result was analyzed and conclusions were made