4001 KB38 KB199920252016Araee, AlirezaSenkara, JacekSohrabian, MajidVardanjani, Mehdi JafariZarandooz, Roozbehletnik:62številka:nr. 11str. 625-635ISSN:0039-2480COBISSID_HOST:15030811URN:URN:NBN:SI:doc-LGQJ8UHCenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikanaliza po metodi končnih elementoveksperimentinačin odpovedinatezna in strižna trdnostpojav vzporednih tokovtoplotno vplivano področjeInfluence of shunting current on the metallurgical and mechanical behaviour of resistance spot-welded joints in AA2219 joints|The effects of shunting current on metallurgical and mechanical behavior of resistance spot-welded (RSW) joints in AA2219 sheets are analysed experimentally via the investigation of mechanical and metallurgical properties, while numerical results predicted by the finite element method (FEM) are used to check the thermal aspects of the phenomenon and its effect on experimental results. Welding distance is chosen as the main variable for two consecutive nuggets. Predicted temperature distribution and cooling rates of FEM are verified by checking the nuggets and heat-affected zone (HAZ) dimensions, the SEM investigation of cracks, and performing a tensile-shear test. Experimental results have been in agreement with the predicted results, since HAZ development, the presence of cracks, interfacial failure, and poor mechanical strength of shunted nugget with shorter welding distance are all predicted in the form of temperature distribution and cooling rates of shunted nugget in finite element analysis (FEA). The temperature dependence of material properties and coupling between all aspects of the solution are respected in the FEA model while experimental tests are performed according to a three-factor design of experiment (DOE) to set the levels of factors based on their significanceUporovno točkovno varjenje (RSW) je eden najbolj razširjenih postopkov pri izdelavi karoserij vozil. S tem postopkom je mogoče izdelati enega samega ali več točkovnih zvarov v vrsti, v slednjem primeru pa se pojavijo vzporedni tokovi. Vzporedni tokovi pri uporovnem točkovnem varjenju nastanejo, ko si električni tok poišče pot skozi predhodne točkovne zvare v vrsti. Velikost teh tokov je odvisna predvsem od dejavnikov kot so oddaljenost, število in velikost predhodnih točkovnih zvarov. V prizadeti zvarni leči se pojavijo dimenzijske in metalurške spremembe kot posledica sprememb v porazdelitvi električnega toka in toplote. Pojav je bolj izražen pri zlitinah z veliko električno prevodnostjo, kot so aluminijeve zlitine, vse pomembnejši pa bo tudi v industrijah z mnogimi vmesnimi točkovnimi zvari (npr. v letalski in vesoljski industriji)TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo