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Title:The fracture behaviour of global/local mis-matched weld joints provided on HSLA steels
Authors:Rak, Inoslav (Author)
Gubeljak, Nenad (Author)
Praunseis, Zdravko (Author)
Inštitut za kovinske materiale in tehnologije (Authorship owner)
Files:.pdf Materiali_in_tehnologije_2001_Rak,_Gubeljak,_Praunseis_The_fracture_behaviour_of_globallocal_mis-matched_weld_joints_provided_on_HSLA_st.pdf (441,77 KB)
 
URL http://mit.imt.si/Revija/izvodi/mit0134/rak.pdf
 
Language:English
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
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
Year of publishing:2001
Number of pages:str. 89-98
Numbering:št. 3/4, Letn. 35
ISSN:1580-2949
UDC:621.791.05:539.4
ISSN on article:1580-2949
COBISS_ID:6474518 Link is opened in a new window
NUK URN:URN:SI:UM:DK:JXVUWKJJ
Views:1190
Downloads:60
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:Slovenian
Title:Pojav loma v globalno/lokalno trdnostno neenakih zvarnih spojih, izvedenih na visokotrdnostnih jeklih
Abstract:Raziskovan je bil pojav loma v zvarnih spojih, izvedenih na visokotrdnostnem jeklu, ki so vsebovali mehke korenske varke. Dva različna dodajna materiala z različno trdnostno neenakostjo (1>M>1) in lomno žilavostnimi lastnostmi v strjenem zvaru sta izrazito povišala kompleksnost vpliva trdnostne neenakosti in pojave loma v zvarnih spojih. Navedeni vpliv je bil odvisen od položaja razpoke in debeline mehkega korenskega sloja. Namen je bil raziskati vpliv trdnostne heterogenosti med osnovnim materialom in strjenim zvarom in med različnimi področji v strjenem zvaru (globalna/lokalna trdnostna neenakost). Poleg tega so bile obravnavane odpornostne krivulje področij v strjenem zvaru in toplotno vplivanem področju. Zaključek je, da je uporaba varilne tehnologije z dvovarkovnim mehkim slojem, ki je vnesen zaradi znižanja ali celo preprečitve predgrevanja, priporočljiva za trdnostno neenake zvarne spoje pri jeklih tipa HT80. Pri tem pa je treba upoštevati nalegiranje, ki izhaja iz osnovnega materiala, in vpliv popuščanja od naslednjih varkov. To lahko povzroči zmanjšanje duktilnosti v področju korena in vpliva na lokalno trdnostno neenakost v osnovnem materialu in toplotno vplivanem področju. Poslabšanje lastnosti z uporabo mehkega korenskega sloja je verjetno lahko znižati z uporabo ustreznega dodajnega materiala in izbrano varilno tehnologijo. Sklepamo, da je uporaba trdnostno neenakega zvarnega spoja z mehkim korenskim slojem priporočljiva le, če je korenska žilavost visoka.
Keywords:varjenje, zvarni spoji, trdnostno neujemanje, lomna žilavost, CTOD, trdota, udarana žilavost, visoko trdnostna nizko legirana jekla


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