Zur Festigkeit und Duktilität von Schweißverbindungen an höherfesten Stählen

Stroetmann, Richard; Kästner, Thoralf; Hälsig, André; Mayr, P.

doi:10.1002/stab.201900062

Cited by 4 publications

(17 citation statements)

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“…While a significant increase in the load-bearing capacity could be observed between filler metals G42 and G62 (D = 15.5 %), the difference between filler metals G62 and G79 was small (D = 4.0 %). This behavior is consistent with the results from the investigations on longitudinal fillet welds at lap joints and the tests on flat tensile specimens with holes described in [1][2][3][4].…”

Section: Joint Type Materials Combination S500m-g35 S500m-g62 S690q-g62 S700m-g79 S960q-g42supporting

confidence: 91%

“…The authors give a detailed description of the specimen and selected tests in [1][2][3][4]. In the series of small scale tests, the influences of the base material and filler metal, the cooling time t 8/5, between 800°C and 500°C, in the interval of 5 to 20 seconds, the number of layers and the opening angle were investigated.…”

Section: New Design Model For Welded Jointsmentioning

confidence: 99%

“…At least 4 tests were carried out for each parameter combination, the weld thicknesses were between 3 mm (lap joints) and 20 mm (fully penetrated butt joints). The properties of the investigated base materials and filler metals are documented in [1][2][3][4] and the detailed test program for the joints in [1].…”

Section: Articlementioning

confidence: 99%

“…The evaluation of 120 test results in [1,2,4] shows that the weld tensile strength f wu is significantly influenced by the filler metal and the cooling time t 8/5 . A significant influence of the base material, the number of weld layers and the type of production (automated or manual) could not be determined.…”

Section: Articlementioning

confidence: 99%

“…This was done to calibrate the weld construction factor a w , which takes into account the influence of the type of joint on the load-bearing capacity. In the following article, after a short summary of the current state of research, the design model, and the results from the parameter studies on flat tensile tests are described in more detail in [2][3][4]. Subsequently, the test program on welded joints and the calibration of the weld construction factor a w are presented.…”

mentioning

confidence: 99%

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A new design model for welded joints

Stroetmann

Kästner

2021

Steel Construction

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In the AiF‐FOSTA research project P1020 [1], a new design model for welded joints was developed. In this context, a small scale test on flat tensile specimens was designed, with the help of which various influences on the strength and ductility of the welds were investigated. Furthermore, extensive tests were carried out on overlap joints, cruciform joints with double fillet welds as well as partially and fully penetrated butt joints. This was done to calibrate the weld construction factor αw, which takes into account the influence of the type of joint on the load‐bearing capacity. In the following article, after a short summary of the current state of research, the design model, and the results from the parameter studies on flat tensile tests are described in more detail in [2–4]. Subsequently, the test program on welded joints and the calibration of the weld construction factor αw are presented. Finally, the results of the design model and the tests carried out are compared with test results from other research projects and the design model of prEN 1993‐1‐8 [5].

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Section: Joint Type Materials Combination S500m-g35 S500m-g62 S690q-g62 S700m-g79 S960q-g42supporting

confidence: 91%

Section: New Design Model For Welded Jointsmentioning

confidence: 99%

Section: Articlementioning

confidence: 99%

Section: Articlementioning

confidence: 99%

mentioning

confidence: 99%

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A new design model for welded joints

Stroetmann

Kästner

2021

Steel Construction

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Investigations on the material behaviour of weld seams for the use in finite element analyses

Kuntsche,

Lange

2023

ce papers

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The design of complex structural steel connections by finite element analysis is common practice nowadays. However, for welded joints there are no normative regulations for the static finite‐element‐analysis. To analyse the specific material behaviour in the weld area and derive a geometry and material model for the finite element analysis, tensile tests on specimens with different weld geometries are made at the Technical University of Darmstadt. During the tests an optical measuring method, called Digital Image Correlation, is used. It records the deformations on the surface of the specimen and assigns the recorded analogue test load to the images. By this way, the load‐deformation‐behaviour in all areas of the weld can be determined. In addition to the tensile tests, microsection examinations are carried out. The applied colour etching makes the microstructure of the weld zones visible so they can be geometrically superimposed with the strain images of the tensile tests. In welded connections the stress state is very complex. Therefore, numerical investigation must be performed to derive the final stress‐strain‐curves of the weld area. These curves can then be implemented as a material model for the finite element analysis of welded connections.

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Ausführung und Fertigung von geschweißten, hochfesten Hohlprofilknoten

et al. 2022

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Etablierte Fertigungsmöglichkeiten erlauben den genauen Zuschnitt der Kontur von auf Hohlprofilgurten aufgesetzten Fachwerkstäben als runde oder rechteckige Hohlprofile. Bei der Tragfähigkeitsberechnung von Hohlprofilanschlüssen nach DIN EN 1993‐1‐8 und ISO 14346 werden volltragfähige Schweißverbindungen vorausgesetzt. Einflüsse auf die Tragfähigkeit von Hohlprofilanschlüssen haben u. a. die Schweißnahtgeometrie, die Stähle der Gurte und Füllstäbe sowie die verwendeten Schweißzusatzwerkstoffe und Schweißprozesse. Verschiedene Versagensformen setzen voraus, dass der Anschluss eine ausreichende Duktilität ausweist. Daher muss ausreichend plastisches Umlagerungsvermögen vorhanden sein. Mit zunehmender Streckgrenze wird es schwieriger, diese Voraussetzung zu erfüllen. Gründe hierfür können in einer Festigkeitsreduzierung oder Versprödung der Schweißnahtbereiche liegen. Um ein vorzeitiges Versagen innerhalb der Wärmeeinflusszone zu vermeiden, ist eine sach‐ und fachgerechte Ausführung der Schweißverbindungen erforderlich. In einem weiteren Beitrag der vorliegenden Ausgabe der Stahlbau wird auf die statische Tragfähigkeit geschweißter, hochfester Hohlprofilknoten eingegangen. Zu den hierzu laufenden AiF‐FOSTA‐Forschungsvorhaben wird eine Übersicht gegeben. Im folgenden Beitrag wird die Bemessung und Ausführung von Schweißverbindungen an hochfesten Stahlhohlprofilen erläutert. Dabei wird zunächst auf die Bemessungsregeln von Schweißnahtverbindungen in der Neuausgabe der EN 1993‐1‐8 eingegangen. Es folgen Erläuterungen zur Herstellung geschweißter Stahlhohlprofilanschlüsse einschließlich des Zuschnitts, der Flankenvorbereitung und der schweißtechnischen Ausführung. Darauf aufbauend wird die Entwicklung eines Versuchsprogramms zur Untersuchung von Füllstab‐Gurt‐Anschlüssen vorgestellt und der Einfluss der Fertigungsparameter auf die mechanischen Eigenschaften der Schweißnähte und der Wärmeeinflusszone beschrieben.

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Zur Festigkeit und Duktilität von Schweißverbindungen an höherfesten Stählen

Cited by 4 publications

References 3 publications

A new design model for welded joints

A new design model for welded joints

Investigations on the material behaviour of weld seams for the use in finite element analyses

Ausführung und Fertigung von geschweißten, hochfesten Hohlprofilknoten

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