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Poliuretansko peno lahko poleg lepljenja spajamo tudi z varjenjem z vročim zrakom. Za uspešno varjenje z vročim zrakom potrebujemo ustrezno napravo za varjenje, ki omogoča natančno varjenje in dobro ponovljivost procesa. Poleg naprave za varjenje potrebujemo tudi optimalne parametre varjenja, ki zagotavljajo dovolj velik vnos toplote v cono varjenja. V diplomski nalogi je predstavljena poliuretanska pena in njene glavne lastnosti. Predstavljena je naprava za varjenje in njeni sestavni deli ter optimalni parametri varjenja. Optimalne parametre smo določili s poskušanjem. Izveden je bil ročni natezni preizkus in mikroskopska analiza zvarnih spojev. Na osnovi rezultatov smo določili okno procesnih parametrov, ki omogočajo uspešno varjenje poliuretanske pene. In addition to adhesive bonding, polyurethane foams can also be joined by hot air welding. For successful hot air welding, we need appropriate welding apparatus that enables accurate welding and good reproducibility of the process. In addition to preparation for welding, we also need optimal welding parameters that ensure sufficient heat input into the welding zone. The thesis presents polyurethane foam and its main properties. The apparatus for welding and its components as well as the optimal welding parameters are presented. The optimal parameters were determined using a trial and error approach. A manual tensile test and a microscopic analysis of the welds were performed. Based on the results, we determined a window of process parameters that enable successful welding of polyurethane foams.