ВЛАСТИВОСТІ З'ЄДНАНЬ АЛЮМІНІЄВОГО СПЛАВУ МАРКИ В1341Т В УМОВАХ TIG ЗВАРЮВАННЯ

The paper presents the results of studying the weldability of sheet aluminium alloy of V134T grade of Al-Mg-Si-Cu-Fe system under the conditions of nonconsumable electrode manual argon-arc welding. This alloy is characterized by high susceptibility to hot cracking in welding. The hot brittleness index is equal to A = 65.8 – 85.5 %. The impact of filler material chemical composition on hot cracking resistance of weld metal was studied. It is found that in welding by batch-produced wires of SvAMg63, Sv1201, Sv1217 grades the crack resistance value is A = 30.3 – 53.9 %, and at application of wire of ZvAK5 grade this characteristic of welds is equal to A = 6.6 – 19.8 %. Nonconsumable electrode manual argon-arc welding of V1324T alloy allows producing tight sound joints of this material with strength coefficient of 0.80 – 0.87 which also depends on filler wire chemical composition. The value of ultimate strength of the alloy welded joints, made using different grades of filler wire is equal to σt = 193.2 – 209.0 MPa, and the yield limit σ0.2 = 138.4 – 151.6 MPa; relative elongation δ = 3.1 – 5.4 %, bend angle α – 40 – 65 deg. [ABSTRACT FROM AUTHOR]