28 KB3152 KB22 KB200020242012Çam, GürelErim, SeçilIpekoglu, GüvenKiral, Binnur Görenletnik:46številka:6str. 627-632ISSN:1580-2949COBISSID:956586URN:URN:NBN:SI:doc-NLKXOV4EenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloymehanske lastnostivarjenje s trenjemzvariInvestigation of the effect of temper condition on the friction-stir weldability of AA7075 Al-alloy plates| Raziskovanje učinka popuščanja plošče iz aluminijeve zlitine AA7075 na varivost s trenjem|Al-alloys are widely used in the transportation industries due to their low density and excellent formability properties. These alloys, which are problematic in fusion-welding processes, can be successfully joined by friction-stir welding. Particularly high-strength AA7075 alloy is considered to be non-weldable by fusion welding. Friction-stir welding, being a solid-state joining technique, can also be successfully used in joining other difficult-to-weld alloys. In this study, 3.17-mm-thick, AA7075 Al-alloy plates both in the O- and T6-temper conditions were joined by friction-stir welding using four different weld parameters. Microstructural and mechanical characterizations of the joints produced were obtained with detailed optical microscopy investigations, extensive hardness measurements and tensile tests. The effect of temper condition on the joint performance was determined in addition to the effect of the weld parameters on the joint qualityAluminijeve zlitine se pogosto uporabljajo v transportni industriji zaradi majhne gostote in odličnih preoblikovalnih lastnosti. Z varjenjem s trenjem se je mogoče izogniti težavam, ki nastopajo med talilnim varjenjem teh zlitin, in sicer predvsem napakam ob liniji zlitja. Predvsem visokotrdnostna aluminijeva zlitina AA7075 se šteje kot težko variva s talilnim varjenjem. Varjenje s trenjem se je izkazalo kot ustrezen postopek za spajanje te zlitine. V okviru prispevka smo s trenjem zavarili 3.17 mm debelo ploščo iz aluminijeve zlitine AA7075 v dveh stanjih: brez popuščanja (stanje O) in z njim (stanje T6). Varili smo večkrat z različnimi parametri varjenja s trenjem. Iz zavarjenih plošč smo pripravili vzorce in eksperimentalno ugotovili mehanske lastnosti. Izmerili smo trdoto in naredili natezne preizkuse ter opravili podrobne metalografske preiskave. Dodatno k učinku parametrov varjenja na kvaliteto spoja je bil določen tudi učinek popuščanja, ki se izraža pri varilnih parametrih in s tem vpliva na kakovost zavarjenega spojaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije