Issue 46

I. Čamagić et alii, Frattura ed Integrità Strutturale, 46 (2018) 371-382; DOI: 10.3221/IGF-ESIS.46.34 373 Specimen mark Yield stress, R p0.2 , MPa Tensile strength, R m , MPa Elongation, A, % Impact energy, J E 320 450 34.0 155 N 325 495 35.0 165 Table 2 : Mechanical properties of exploited and new PM specimens. Additional material % max. C Si Mn P S Cr Mo LINCOLN Sl 19G 0.07 0.31 0.62 0.009 0.010 1.17 0.54 LINCOLN LNS 150 0.10 0.14 0.71 0.010 0.010 1.12 0.48 Table 3 : Chemical composition of additional welding materials. Additional material Yield stress, R p0.2 , MPa Tensile strength, R m , MPa Elongation, A, % Impact energy, J at 20  C LINCOLN Sl 19G 515 610 20 > 60 LINCOLN LNS 150 495 605 21 > 80 Table 4 : Mechanical properties of filler materials. D ETERMINATION OF TENSILE PROPERTIES asic characteristics of material strength, as well as the stress-elongation curves required for stress analysis, are obtained by tensile testing. Tensile testing of butt welded joint at room temperature, including the shape and dimensions of specimens as well as the procedure itself are defined by SRPS EN 895:2008 standard, [5]. This standard primarily defines transverse tension, i.e. introduction of the load transversely to the welded joint. SRPS EN 895:2008 standard also envisages the determination of the tensile properties of PM and WM at room temperature. Determination of tensile properties of PM is defined by SRPS EN 10002-1 standard, [6]. Figure 1 : Tensile test specimens for WM and HAZ. Unlike room temperature testing, the testing procedures at increased temperature of 540  C, as well as the specimen geometry are defined by SRPS EN 10002-5 standard, [7]. The specimens used for determining of tensile properties of WM and HAZ, as well as for working temperature tensile tests are shown in Figs. 1 and 2, respectively. B