The experiment have been performed using samples of welded joints of the three components aluminium alloy AlMg4,5Mn. The welding was performed with GTAW in the shielded atmosphere of Ar+0,015N2, mixture of the inert gases Ar+50%He+0,015N2 and Ar+70%He+0,015N2. After welding has been completed, the metallographic tests, the tensile test and the tests of the hardness were performed. Also, the weld metal toughness was estimated, using the instrumental Charpy impact testing system, followed by estimating the crack initiation energy, crack growth energy and the fracture mechanics parameters. The goal was to establish the effects of shielding atmosphere composition on the mechanical properties and fracture mechanics parameters of weld metal
Kljucne reči: aluminijum, legura AlMg4.5Mn, metal šava, zavarljivost, zaštitna atmosfera, poroznost Key words: aluminium, AlMg4.5Mn alloy, weld metal, weldability, gas shielding atmosphere, porosity AbstractIn this paper is shown the influence of gas shielding atmosphere on the weldability of AlMg4.5Mn alloy. Prepared plates were welded using tungsten inert gas (TIG) with four different shielding atmospheres. Metallographic testing, tensile testing and hardness testing of welded joints were carried out. It has been shown that composition of shielding atmosphere has effect on the weld appearance, depth of penetration, overflowing of filler material, porosity in the weld metal, as well as on values of tensile strength and hardness. Weldments obtained by welding in a shielding atmosphere Ar + 50% He + 0.015% N 2 have the best appearance of the weld metal, good overflowing of filler material and satisfactory width to hight ratio. It was also established that these welds have the lowest weld metal porosity. IzvodU ovom radu je prikazano kako vrsta zaštitne atmosfere utiče na zavarljivost legure aluminijuma AlMg4.5Mn. Pripremljene ploče su zavarene TIG postupkom u četiri različite zaštitne atmosfere. Posle izvedenog zavarivanja, urađena su metalografska ispitivanja, ispitivanje zatezne čvrstoće zavarenog spoja u celini, kao ispitivanje tvrdoće zavarenog spoja. Pokazano je kako vrsta zaštitne atmosfere utiče na oblik šava, dubinu uvarivanja, razlivanje dodatnog materijala, pojavu poroznosti u metalu šava, kao i na vrednosti zatezne čvrstoće i tvrdoće. Šavovi dobijeni zavarivanjem u zaštitnoj atmosferi Ar+50%He+0,015%N 2 pokazali su najbolji izgled metala šava, pri čemu je dobro razlivanje dodatnog materijala a odnos širine i visine šava zadovoljavajući. Takođe je pokazano da ovako dobijeni šavovi imaju najmanju poroznost metala šava.
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