Influence of cooling rate on tensile behaviour of S690Q high strength steel butt joint

A macro prediction model for butt-welded (U)HSS connections with softened HAZ

“…Many experimental studies have been carried out to investigate the tensile behaviour of butt-welded high-strength steel (HSS, 460 MPa ≤ f y ≤ 700 MPa) and ultra-high-strength steel (UHSS, f y > 700 MPa) connections [1,3,6,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. HAZ plays a vital role in the welded connection if HAZ has the lowest strength in the entire weld region.…”

“…Hence, it is important to know the mechanical properties of HAZ to simulate the behaviour or determine the resistance of the welded connection properly. The stress-strain constitutive model of HAZ has been obtained using different methods [1,2,4,6,14,15,17,19,21,[23][24][25][26][27], as introduced in [11]. As the mechanical property of HAZ is closely related to the experienced highest temperature and the cooling time during welding, Stroetmann et al [1] tested HAZ with different combinations of the highest temperature and the cooling time.…”

“…As the resistance of the welded connection decreases with the decrease of WM strength in general [20], the strengths of BM and WM are considered in the current design rule of prEN 1993-1-8 [28]. However, the failure of welded connection is often governed by HAZ [6,11,13,16,18,[20][21][22]24]. Hence, it is unrealistic to accurately predict the tensile resistance of HSS and UHSS connections without considering the strength of HAZ.…”

The Numerical Modelling Approach with a Random Distribution of Mechanical Properties for a Mismatched Weld

“…The local mechanical properties at the BM, HAZ and inhomogeneous weld should be considered in order to consider the structural integrity for designing the weld structures. In the past, detailed experimental investigations were carried out for multi pass welds to analyse the local mechanical performance inside the weld and HAZ [ 21 , 22 , 23 , 24 , 25 ] in the SENB specimen. It is known that mechanical properties such as spatial yield stresses vary within the hardener and softer zones (HAZs) and the weld region.…”

A Method for Determining the Constitutive Model of the Heat-Affected Zone Using Digital Image Correlation

“…The additional practical problem is to obtain the micro-specimen with the homogeneous material. The thermal--mechanical FEA [10,11] is used in the third approach. Based on the elements' highest history temperature obtained from the thermal finite element (FE) model, unique material property is assigned to each element in the mechanical FE model.…”