1875 KB25 KB200020242013Patil, HiralalSoman, Sanjayletnik:47številka:5str. 639-645COBISSID:1020074ISSN:1580-2949URN:URN:NBN:SI:doc-I2H7ZWYCenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloykorozijapreiskava materialovtorno vrtilno varjenjeInfluence of weld-process parameters on the material characterization of the friction-stir-welded joints of the AA6061-T6 aluminium alloy| Vpliv parametrov postopka varjenja na lastnosti torno-vrtilno varjenih spojev aluminijeve zlitine AA6061-T6|Friction-stir welding (FSW), a solid-state innovative joining technique, is being widely used for joining aluminium alloys for the aerospace, marine, automotive industries and many other applications of commercial importance. FSW trials were carried out using a vertical machining centre (VMC) on an AA6061 alloy. The main objective of the present work was to evaluate the weld-processing parameters of FSW for the AA6061-T6 alloy and to determine the properties of the obtained joints with respect to the welding speed. The experiments were conducted by varying the welding speed between 55-70 mm/min and the rotating speed was fixed at 1700 r/min. The tensile properties, microstructure, microhardness, fractography and corrosion resistance of the FSW joints were investigated in this study. The result showed that there was avariation in the grain size in each weld zone depending upon the material and the process parameters of FSW in a joint. The coarsest grain size was observed in the heat-affected zone (HAZ), followed by the thermo-mechanically affected zone (TMAZ) and the nugget zone (NZ). The maximum tensile strength of 184 MPa and the highest joint efficiency of 49.32 % were obtained on the joint fabricated at the welding speed of 55 mm/minTorno-vrtilno varjenje (FSW) je inovativna tehnika spajanja v trdnem stanju za spajanje aluminijevih zlitin za letalstvo, pomorsko, avtomobilsko industrijo in mnoge druge komercialno pomembne uporabe. FSW-preizkusi so bili izvedeni na vertikalnem obdelovalnem stroju (VMC) z zlitino AA6061. Glavni cilj tega dela je bila ocena varilnih parametrov pri FSW-postopku pri zlitini AA6061-T6 in določitev lastnosti dobljenih spojev glede na hitrost varjenja. Preizkusi so bili izvršeni pri različnih hitrostih varjenja 55-70 mm/min, pri čemer je bila hitrost rotacije stalna pri 1700 r/min. V tej študiji so bile preizkušene natezna trdnost, mikrostruktura, mikrotrdota, fraktografija in korozijska odpornost FSW-spojev. Rezultati so pokazali, da se je v vsaki coni varjenja spreminjala velikost zrn, kar je posledica materiala in procesnih parametrov pri FSW-spoju. Najbolj groba zrna se opazi v toplotno vplivani coni (HAZ), sledi ji termomehansko vplivano področje (TMAZ) in drobnozrnato področje (NZ). Največja natezna trdnost 184 MPa in največja učinkovitost spajanja 49,32 % sta bili doseženi pri spoju s hitrostjo varjenja 55 mm/minTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije