20.500.12556/RUL-190139 Karakterizacija lastnosti zvarnih spojev izdelanih z varjenjem s plazmo in A-plazmo Characterization of the microstructure and mechanical properties of stainless steel welds produced by plasma and A-plasma welding V magistrski nalogi je obravnavano varjenje s plazmo in A-plazmo soležnega zvara pločevine AISI 304, debeline 6 mm, brez predpripravljene zvarne reže. Varjenje je potekalo pri hitrosti 15 cm/min, teme zvara je bilo povarjeno z varjenjem TIG, varilne parametre pa smo beležili. Analiziran je bil učinek uporabe aktivnih delcev pri varjenju s plazmo na zmanjšanje jakosti varilnega toka, obliko in dimenzije zvara, mikrostrukturo zvara ter mehanske lastnosti zvara. Mehanski preizkusi so bili izvedeni na osnovnem materialu in zvaru ter so zajemali natezni preizkus, upogibni preizkus in Charpyjev preizkus žilavosti. Varjenje s plazmo in A-plazmo je zahtevnejše za uporabo, saj ima več vplivnih tehnoloških parametrov kot varjenje TIG. Vrednost varilnega toka, potrebna za prevaritev materiala, se je z uporabo aktivnih delcev zmanjšala. Zvari so imeli ozko toplotno vplivano cono zaradi večje hitrosti varjenja. Mikrostruktura zvara je bila dendritna in drobnozrnata. Raztezki in žilavost zvarjenih vzorcev so bili v primerjavi z osnovnim materialom manjši, medtem ko so bile povprečne vrednosti natezne trdnosti in meje tečenja višje. This master's thesis investigates plasma arc welding and activated plasma arc welding of a single square groove butt joint in 6 mm thick AISI 304 stainless steel plates, without edge preparation. Welding was performed at a travel speed of 15 cm/min. The weld cap was completed using the TIG welding process, and the welding parameters were recorded throughout the experiments. The study analyzes the effect of using an activating flux during plasma arc welding on the reduction of welding current intensity, weld geometry and dimensions, weld microstructure and mechanical properties. Mechanical testing was performed on both, the base material and welded specimens and included tensile, bending, and Charpy impact toughness tests. Plasma arc welding and activated plasma arc welding are more demanding to perform than TIG welding, due to the higher number of influential process parameters. The welding current, required to achieve full penetration of the material, was reduced when activating flux was applied. The welds exhibited a narrow heat-affected zone due to the higher welding speed. The weld microstructure was dendritic and fine-grained. Compared to the base material, the welded specimens showed lower elongation and impact toughness, while their average tensile strength and yield strength were higher. varjenje plazma varjenje A-plazma nerjavno jeklo aktivni delci mehanske lastnosti prevaritev plasma arc welding A-plasma arc welding stainless steel activating flux mechanical properties weld penetration true false false [T. Kernel] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-10-23 08:30:53 2026-10-23 08:30:58 2026-10-26 13:04:50 0000-00-00 00:00:00 2026 0 Ljubljana 0 XXIV, 86 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.755:538.951(043.2) 294387 302515715 51240.pdf 51240.pdf 1 4391893A65985B377A4883E0D60EE735 7690539481de50cd45978cfd4aafcf92309de8bd7ecc4a2f8c6083564ac68a68 507c3e79-ceab-11f1-aea2-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=251306 Fakulteta za strojništvo 0 0 0