Influence of the optical measurement technique and evaluation approach on the determination of local weld geometry parameters for different weld types

Schubnell, Jan; Jung, Matthias; Le, Chanh Hieu; Farajian, Majid; Braun, Moritz; Ehlers, Sören; Fricke, Wolfgang; Garcia, Martin; Nussbaumer, Alain; Baumgartner, J. Craig

doi:10.1007/s40194-019-00830-0

Cited by 34 publications

(41 citation statements)

References 19 publications

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“…A significant lower SCF was determined for the investigated welded joints in repaired condition caused by significant smaller flank angles [32]. Investigations at T-joints made of S355 show a high influence of the local weld geometry on the fatigue performance [28].…”

Section: Discussionmentioning

confidence: 85%

“…Besides this, recommendations on flank angles are given in standard ISO 5817:2014-06. Thus, the geometrical parameters of the weld flank angle θ t and the weld toe radius ρ according to the definition of [31] were analyzed as part of study [32]. All measurements were performed with a 3D-laser scanner and evaluated according to the so-called curvature-method [33].…”

Section: Investigation Of Weld Properties 41 Geometrical Propertiesmentioning

confidence: 99%

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Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Schubnell

Ladendorf

Sarmast

et al. 2021

Metals

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Large portions of infrastructure buildings, for example highway- and railway bridges, are steel constructions and reach the end of their service life, as a reason of an increase of traffic volume. As lifetime extension of a commonly used weld detail (transverse stiffener) of these structures, a validated approach for the weld repair was proposed in this study. For this, welded joints made of S355J2+N and S960QL steels were subjected to cyclic loading until a pre-determined crack depth was reached. The cracks were detected by non-destructive testing methods and repaired by removal of the material around the crack and re-welding with the gas metal arc welding (GMAW). Then, the specimens were subjected to cyclic loading again. The hardness, the weld geometry, and the residual stress state was investigated for both the original- and the repaired conditions. It was determined that nearly all repaired specimens reached at least the fatigue life of the original specimen.

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Section: Discussionmentioning

confidence: 85%

Section: Investigation Of Weld Properties 41 Geometrical Propertiesmentioning

confidence: 99%

Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Schubnell

Ladendorf

Sarmast

et al. 2021

Metals

Self Cite

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“…Moreover, secondary bending effects due to misalignment are considered in a simplified way as an increased nominal stress, which is thought to be conservative. 3,43 For this purpose, the standard formulas given in international standard and guidelines are applied, see other studies. 45,46 First of all, the fatigue data of most test series fit nicely into the proposed scatter band for welded joints 47 ; and, as expected, the fatigue strength of the tests at subzero temperatures are closer to the upper limit of the scatter band.…”

Section: Fatigue Test Results Of Welded Joints Obtained At Sub-zeromentioning

confidence: 99%

“…All specimens were welded by means of flux‐cored arc welding process, see Braun et al 39 for further details. Before the test, the misalignment and local weld geometry of every specimen were measured based on the curvature method (see other studies 43,44 ). Thus, the actual throat thickness of each cruciform specimens has been used to calculate the nominal stress acting in the fillet weld.…”

Section: Fatigue Test Results Of Welded Joints Obtained At Sub‐zero Tmentioning

confidence: 99%

“…Due to the small variation of throat thickness between the test specimens, the median weld throat thickness is used in the FE models of the cruciform joints (i.e., a = 5.71 mm and a = 5.85 mm for S235 and S500 cruciform joints, respectively); however, the throat thickness of each specimen is used to calculate the actual nominal stress. Moreover, secondary bending effects due to misalignment are considered in a simplified way as an increased nominal stress, which is thought to be conservative 3,43 . For this purpose, the standard formulas given in international standard and guidelines are applied, see other studies 45,46 …”

Section: Fatigue Test Results Of Welded Joints Obtained At Sub‐zero Tmentioning

confidence: 99%

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Extension of the strain energy density method for fatigue assessment of welded joints to sub‐zero temperatures

Braun

Fischer²,

Fricke

et al. 2020

Fatigue Fract Eng Mat Struct

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Within stress-based fatigue assessment concepts, causes that do not influence the fatigue stress parameters, such as temperature, can only be accounted for by means of modification factors. The strain energy density (SED) method allows to account for changing material support effects and Young's modulus with temperature directly. Thus, in this study, a concept is presented to extend the SED method for fatigue assessment of welded joints at sub-zero temperatures. For this purpose, fatigue test results of welded joints made from normal and high-strength structural steel are assessed in the range of 20 C down to −50 C. The results are evaluated based on the formula that is used to derive the SED control radii of welded joints and compared with results of studies on SED-based assessment of notched components at high temperatures. From the estimates of the control radii, a temperature modification function for SED is derived for design purposes.

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Development of an automated quality assurance approach for welded joints

Dänekas,

Schaumann,

Ghafoori

et al. 2023

ce papers

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A more economical and resource‐saving construction of offshore wind energy converters is necessary in order to achieve climate policy objectives. Automated quality assurance of welded joints offers a great potential to enable less conservative manufacturing of the support structures. The main objective of this study is to find a correlation between the parameters that describe the weld geometry and the fatigue life. Butt welded specimens were scanned with a laser line sensor. The weld seam parameters including notch radius and flank angle were evaluated and the stress concentration factors in the notch were determined considering the microstructural support effect. A series of constant amplitude fatigue tests was conducted in order to evaluate S‐N‐curves according to nominal stress approach and notch stress approach. The fatigue results show a good correlation between notch stresses and fatigue life, demonstrating the great potential of the quality assurance approach for evaluating the weld seam geometries.

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Influence of the optical measurement technique and evaluation approach on the determination of local weld geometry parameters for different weld types

Cited by 34 publications

References 19 publications

Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Extension of the strain energy density method for fatigue assessment of welded joints to sub‐zero temperatures

Development of an automated quality assurance approach for welded joints

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