Influence of Weld Defects on the Fatigue Resistance of Thick Steel Plates

Schaumann, Peter; Collmann, Mareike

doi:10.1016/j.proeng.2013.12.062

Cited by 15 publications

(9 citation statements)

References 4 publications

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“…A36-GL [21] and DH36 [22] steels welded by FSW reached fatigue strength values significantly above design recommendations [1,2]. A similar effect was observed for high-quality fusion welds [23,24]. Earlier results [3] also showed that fatigue behaviour benefits from higher BM strength.…”

Section: Introductionmentioning

confidence: 60%

Microstructure and fatigue properties of friction stir welded high-strength steel plates

Sorger

Lehtimäki

Hurme

et al. 2018

Science and Technology of Welding and Joining

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The weldability of high-strength steels (HSSs) is limited by their loss of strength, toughness and fatigue properties. In demanding applications, the fatigue properties of welds are among the strictest requirements. This paper presents a weldability analysis focusing on the microstructure and fatigue properties of 6 mm thick S690 and S355 HSS plates joined by friction stir welding. Their fatigue properties are compared to design recommendations and to fatigue properties obtained with other welding techniques. Results show that the high-quality friction stir welded steel joints outperform high-quality arc welds and FAT80 design recommendations. The fatigue strength of the friction stir welded joints is increased with material yield strength. The mechanisms governing crack initiation at different maximum stress levels are discussed. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 60%

Microstructure and fatigue properties of friction stir welded high-strength steel plates

Sorger

Lehtimäki

Hurme

et al. 2018

Science and Technology of Welding and Joining

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“…In welded components, the weld itself contains process related flaws from which cracks can rapidly propagate. Thus, welding has been demonstrated as an undermining factor to the mechanical properties of such components; specifically under cyclic loading, welds are generally the dominant detail for fracture [10], also characterised as the critical design factor in shipbuilding [7]. In fusion welding, solidification cracking, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In fusion welding, solidification cracking, i.e. minor inner cracks which can act as crack propagation sites during fatigue loads are considered unacceptable by international standards, hence need to be avoided [10]. Undercuts and lack of weld penetration are other examples of intolerable defects which are widely reported as highly detrimental features in terms of fatigue life [11].…”

Section: Introductionmentioning

confidence: 99%

Systematic investigation of the fatigue performance of a friction stir welded low alloy steel

et al. 2015

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A comprehensive fatigue performance assessment of friction stir welded DH36 steel has been undertaken to address the relevant knowledge gap for this process on low alloy steel. A detailed set of experimental procedures specific to friction stir welding has been put forward, and the consequent study extensively examined the weld microstructure and hardness in support of the tensile and fatigue testing. The effect of varying welding parameters was also investigated. Microstructural observations have been correlated to the weldments’ fatigue behaviour. The typical fatigue performance of friction stir welded steel plates has been established, exhibiting fatigue lives well above the weld detail class of the International Institute of Welding even for tests at 90% of yield strength, irrespective of minor instances of surface breaking flaws which have been identified. An understanding of the manner in which these flaws impact on the fatigue performance has been established, concluding that surface breaking irregularities such as these produced by the tool shoulder’s features on the weld top surface can be the dominant factor for crack initiation under fatigue loading

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“…FSW needs to be optimised with regard to high welding speed of defect-free welds of acceptable quality, within specifications or classification society rules in the case of shipbuilding and marine applications, rather than best possible mechanical properties for wider industrial introduction and a detailed optimisation study is currently available in the public domain [13]. From this study [14] it is proposed that, for FSW of steel to become an economically and technically viable alternative to conventional fusion welding processes, further advances in tooling design (material, geometry and cost) is of fundamental importance.…”

Section: Introductionmentioning

confidence: 99%

“…These are selected from a comprehensive and considerable spread of over 200, 2000 mm long FSW DH36 butt joints in which slow, intermediate and fast welding speeds were trialled. Through this process parameter development, the state of the art has been increased from conventionally adopted welding speed of 100 mm/min to more commercially attractive speeds in the region of 400 mm/min -500 mm/min. However, welding is known to substantially affect the microstructure and mechanical properties of components and structures [14]. Although a step change in the welding speed has been identified, the purpose of the research work presented herein is to assess the impact of this increase on the microstructural evolution and mechanical properties of each friction stir weld.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Steel Friction Stir Welding: Project HILDA

Toumpis

Galloway

Camilleri

et al. 2015

Volume 2B: Advanced Manufacturing

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Friction stir welding of steel presents an array of advantages across many industrial sectors compared to conventional fusion welding techniques. Preliminary studies have identified many positive effects on the properties of welded steel components. However, the fundamental knowledge of the process in relation to structural steel remains relatively limited, hence industrial uptake has been essentially non-existent to this date. The European-funded project HILDA, the first of its kind in terms of breadth and depth, is concerned with enhancing the understanding of the process on low alloy steel, establishing its limits in terms of the two more significant parameters which can be directly controlled, tool traverse and rotational speed, thus improving its techno-economic competitiveness to fusion welding. A detailed study investigated the effect of process parameters on the evolved microstructure. In parallel, a full programme of mechanical testing was undertaken to generate data on hardness, impact toughness and fatigue. From this, it has been established that friction stir welding of steel produces high integrity joints that exhibit excellent fatigue properties. From a simulation perspective, a local microstructural numerical model has been developed to predict the microstructural evolution within the weld zone during friction stir welding of low alloy steel. This model concentrates on predicting grain size evolution due to dynamic recrystallization with respect to tool traverse and rotational speed. Furthermore, a computational efficient local-global numerical model capable of predicting the thermal transients, stir and heat affected zone, residual stresses and distortion produced by friction stir welding of DH36 plates is presented.

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Influence of Weld Defects on the Fatigue Resistance of Thick Steel Plates

Cited by 15 publications

References 4 publications

Microstructure and fatigue properties of friction stir welded high-strength steel plates

Microstructure and fatigue properties of friction stir welded high-strength steel plates

Systematic investigation of the fatigue performance of a friction stir welded low alloy steel

Recent Developments in Steel Friction Stir Welding: Project HILDA

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