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Vpliv varilnih postopkov na dinamično nosilnost zvarnih spojev izvedenih na visokotrdnostnem jeklu
Roman Krepek, 1990, undergraduate thesis

Published: 26.07.2007; Views: 1518; Downloads: 0

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Varivostni preizkus z vstavkom na konstrukcijskem jeklu z nizkim PCM
Vladimir Gliha, Tomaž Vuherer, Inoslav Rak, 2003, professional article

Abstract: V industrijski praksi se je treba pri obločnem varjenju ogljikovih konstrukcijskih jekel včasih spoprijeti z možnostjo pojava razpokljivosti v hladnem v večvarkovnih varih. To je le takrat, ko ima dodajni material višji PCM kot osnovni. V pričujočem prispevku smo z metodo vstavka eksperimentalno določili občutljivost enega takšnega vara za razpokljivost v hladnem. Če ima pri varivostnem preizkusu z vstavkom material vstavka nižji PCM od navarka, raztopljeni vodik, ki je bil vnesen v zvarno kopel pri varjenju z oplaščeno elektrodo, ne difundira v vstavek. Kljub nezadostni duktilnosti materiala vstavka napetost na meji tečenja ne povzroči nastanka hladnih razpok. Občutljivosti materiala vstavka za razpokljivost v hladnem se v tem primeru ne da oceniti. Možnost difuzije vodika iz navarka v vstavek in iz njega v material podložne plošče je odvisna od kemične sestave. Navarek je material elektrode, nalegiran z osnovno ploščo. Problem difuzije vodika je mogoče obiti z izbiro ustreznega materiala za osnovno ploščo.
Keywords: varjenje, zvarni spoji, varivostni preizkus, hladna razpokljivost, razpoke, metoda vstavka, večvarkovni var, zaostale napetosti, difuzija vodika, navarek, nalegiranje elektode z osnovnim materialom, temperatura predgrevanja
Published: 01.06.2012; Views: 1414; Downloads: 79
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The fracture behaviour of global/local mis-matched weld joints provided on HSLA steels
Inoslav Rak, Nenad Gubeljak, Zdravko Praunseis, 2001, original scientific article

Abstract: The fracture behaviour of thick section high strength steel weldments, that contain soft root passes, has been studied. Two different weld consumables with different strength mismatch (1>M>1) and fracture toughness properties in the WM have significantly increased the complexity of the mis-match effect and failure behaviour of weld joints, depending on the crack location and the thickness of the soft root layer. The aim was to explain the effect of strength heterogeneity between BM and WM and between different regions in WM (global/local mismatching). R-curves of WM and HAZ regions were also discussed. The conclusion is that the application of a welding procedure with a two-pass soft root layer, introduced for the purpose of reducing or even omitting preheating, can be recommended in mis-matched weld joints on steel grade HT80. Nevertheless, the alloying from BM, and the tempering effect of subsequent weld passes, have to be taken into account. They can cause reduction of the root region ductility and affect the local mismatch in WM and HAZ. The deterioration by providing a soft root layer can probably be reduced by a selected consumable and proper welding procedure. The final conclusion is that the application of a mismatched weld joint with a soft root layer can be recommended only if high root toughness can be provided.
Keywords: welding, welded joints, strength mismatching, fracture toughness, CTOD, hardness, impact toughness, HSLA steels
Published: 01.06.2012; Views: 1185; Downloads: 58
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