UNI-MB - logo
UMNIK - logo
 
Knjižnica tehniških fakultet, Maribor (KTFMB)
  • Fracture behaviour of over-matched high strength steel welds containing soft root layers
    Rak, Inoslav ...
    Welding of quenched and tempered (Q+T) high strength structural steels is a complex task due to sensitivity of CGHAZ and WM regions to cold cracking. Generally, preheating has been used to prevent ... cold cracking at the root passes of such weld joints. Alternatively, very soft consumable can be used for root passes without any costly and time consuming preheating procedure. Fracture behaviour of thick section high steel weldments containing such soft root passes are studied in the present article. The existance of two different weld consumable with different strength and fracture toughness properties in the WM, significantly increases the complexity of mis-match effect and failure behaviour of weld joints depending upon the crack location and thickness of soft layer. Fracture toughness properties of X-groove welds om 40 mm thick HT80 grade steel with and without soft root layers were extensively examined. Two and four soft passes were used for the soft layer and the effect of its relative size on toughness properties was examined. SENB deep notched (a/W=0.5) and shallow notched specimens (a/W=0.18-0.38) were fatigue cracked in WM and HAZ regions. The experimental study of all weld joint containing soft root layer showed no cold cracking appearance. Furthermore, transverse strength of the welds showed no degradation of the overall strength. All flat tensile speciments failed in BM. CTOD fracture toughness results are discussed regarding the effectof notch position in the weld joint and notch size (a/W) on SENB specimen behaviour. The aim was to explain the effect of strength heterogeneity between BM and WM and between different regions in WM (global/local mis-matching). R-curves of WM and HAZ regions are also discussed.
    Vir: Mis-Matching of interfaces and welds : performance of strength mis-matched welded or bonded joints (Str. 627-641)
    Vrsta gradiva - prispevek na konferenci
    Leto - 1997
    Jezik - angleški
    COBISS.SI-ID - 3219478

Vnos na polico