Faculty of Mechanical Engineering, Lj. (FSLJ)
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Uporovno varjenje visokotrdnega jekla DP 500 : diplomsko delo Visokošolskega strokovnega študijskega programa I. stopnje StrojništvoAvguštin, SamoV avtomobilski industriji je prisotna težnja po manjši masi vozil. Ena od možnih rešitev za dosego tega cilja je, da naredimo vitko konstrukcijo vozila, kar pa zahteva uporabo materialov, ki imajo ... ugodno razmerje med trdnostjo in težo. Ob tem se pojavi izziv spajanja teh materialov. V proizvodnji srečujemo različne načine spajanja materiala, na primer: kovičenje, uporovno varjenje in druge postopke varjenja. Najpogosteje se uporablja točkovno uporovno varjenje, saj ga lahko avtomatiziramo in ob tem kontroliramo porabo energije na določen varjenec. V primerjavi s kovičenjem je uporovno varjenje hitrejše in cenejše. V diplomski nalogi so predstavljene osnove uporovnega točkovnega varjenja, prikazani so tudi posebni načini tega varjenja. Jeklo DP 500 smo varili pri različnih varilnih parametrih. S trgalnim strojem smo izvedli natezno strižni preizkus vzorcev. Iz dobljenih rezultatov in varilnih parametrov smo prikazali, kako posamezni varilni parametri vplivajo na: silo porušitve, strižno trdnost in razteznost (duktilnost). Vzorce smo vizualno pregledali in jih ocenili. Nepretrgane vzorce smo pripravili za mikroskopsko analizo in preverili, kakšna je usmerjenost zrn ter ali prihaja do razpok v zvaru. Po opravljeni mikroskopski analizi smo pomerili trdoto v zvaru in toplotno vplivani coni po Vickersovi metodi. Ugotovili smo, da pri varilnem toku 8 kA, času varjenja 200 ms in pri sili držanja 2,45 kN dobimo mejne dopustne varilne parametre, saj strižna trdnost zvara presega trdnost osnovnega materiala. Če želimo imeti dovolj veliko strižno trdnost, mora pri sili 3,68 kN in času 300 ms, varilni tok presegati 9,2 kA.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [S. Avguštin], 2020Language - slovenianCOBISS.SI-ID - 17029915
Author
Avguštin, Samo
Other authors
Klobčar, Damjan
Topics
diplomske naloge |
uporovno varjenje |
mikrolegirano jeklo |
visokotrdno jeklo |
natezna trdnost |
trdota |
resistance welding |
microalloyed steel |
high strength steel |
tensile strength |
hardness
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VS 0000000747 IN: 60000747 VS 747 IN: 60000747 |
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Database name | Field | Year |
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Avguštin, Samo | ![]() |
Klobčar, Damjan | 20441 |
Source: Personal bibliographies
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