The toughness of laser welded joints in the ductile–brittle transition

Bezenšek, Boštjan; Hancock, J. W.

doi:10.1016/j.engfracmech.2006.11.011

Cited by 52 publications

(20 citation statements)

References 12 publications

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“…Even though finer dimples (3-5 m) are observed in WZ fractograph, the cleavage fracture feature is evident at several locations. The reasons can be correlated as weld zone formation with combined ductile and brittle fracture modes with the presence of local brittle zones, which has been reported in some studies of laser welds [26][27][28]. The combined ductile and brittle fracture modes formation in the welds reflect the poor absorbed energy in both the HAZ and WZ samples.…”

Section: Impact Fracture Specimens Sem Analysismentioning

confidence: 91%

Studies on mechanical properties, microstructure and fracture morphology details of laser beam welded thick SS304L plates for fusion reactor applications

Buddu

Chauhan

Raole

et al. 2015

Fusion Engineering and Design

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Section: Impact Fracture Specimens Sem Analysismentioning

confidence: 91%

Studies on mechanical properties, microstructure and fracture morphology details of laser beam welded thick SS304L plates for fusion reactor applications

Buddu

Chauhan

Raole

et al. 2015

Fusion Engineering and Design

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“…So in EBW in comparison to most other welding processes, the HAZ is not the critical area with regard to ductility [10]. Previous research by Bezensek et al [10] demonstrated that the lowest ductility in beam welding is the weld centerline. The high cooling rates also lead to high hardness in the FZ and in the HAZ (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…So far, this problem has been addressed in several publications [6,8,[10][11][12][13][14][15][16][17] and different solutions to overcome this problem have been presented. Crack tip opening displacement tests in different modes were performed in some of the previously mentioned publications [10,11,[14][15][16][17]. Research on detecting the ductile-brittle transition temperature was done by Baryraktar et al in [2,18,19].…”

Section: • High Overmatching Situations (U T S F Z Ut S Bm )mentioning

confidence: 99%

Toughness evaluation of EB welds

Wiednig

Enzinger

2017

Weld World

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For over a hundred years, Charpy impact testing has been performed. It is one of the most frequently used material tests. Due to a very simple test setup, a huge wealth of experience and an enormous database of results, it is still state of the art to evaluate toughness of materials and welds. Modern welding technologies like laser welding or electron beam welding (EBW) are characterized by a low heat input. The high energy density of these technologies results in very narrow welds. These kind of joints are difficult to analyse by means of a standard Charpy test. The combination of weld cross section and properties lead in most cases to a fracture path deviation (FPD). Although the crack starts from a notch, it deviates during propagation into the heat-affected zone or even in the base material. Therefore, the weld itself is not tested and cannot be characterized. FPD is a wellknown issue but so far little attention in standards has been paid to this complex topic. Hence, establishing a valid welding procedure specification for beam welding procedures may imply difficulties. This work focuses on avoiding FPD in electron beam welds in soft-matensitic steel (1.4313) by using standard and side notched Charpy impact specimens. Valid toughness result had to be found for 20-and 100-mm-thick welds at −20 • C. Several test with three different kind of specimen in two different heat-treated conditions were carried out. It was found that beside the narrow seam a major reason for FPD is the significant overmatching of the weld. A post weld heat treatment to reduce overmatching facilitates testing but can decrease toughness. Adequate results for qualification were found and EB welds reached sufficient toughness at −20 • C. Toughness of EB welds was compared to the toughness of conventional gas metal arc welds (GMAW). Finally, a recommendation for adapting the toughness characterization for narrow and overmatching seams is proposed.

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“…Laser welding is becoming increasingly popular in shipbuilding industry as it allows low levels of welding distortion at high productivity rates [24]. However, highly localized heat input and cooling rates can lead to strength and toughness mismatch between base and weld material, which can affect the joint ductility especially during large deformations and constrained geometries [25]. Therefore, to examine the joint properties, hardness measurements were performed on stake weld cross-sections cut from the sandwich panels produced along with the stiffened panels reported in this paper, see Fig.…”

Section: Laser Welded Panel Designmentioning

confidence: 99%

Experimental and numerical penetration response of laser-welded stiffened panels

Körgesaar

Romanoff

Remes

et al. 2018

International Journal of Impact Engineering

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A B S T R A C TDuctile fracture in large structures is often resolved with non-linear finite element (FE) simulations employing structural shell elements which are larger than localization zone. This makes solution element size dependent and calibration of material parameters complex. Therefore, the paper explores the ability of numerical simulations to capture the penetration resistance of stiffened panels after determining steel material fracture ductility at different stress states. The numerical simulations are compared with experiments performed with rigidly fixed 1.2 m square panels penetrated with half-sphere indenter until fracture took place. Response of the panels was measured in terms of indentation force versus indenter displacement. In parallel, tensile tests were performed with four different flat specimens extracted from the face sheet of panels to characterize the material fracture ductility at different stress states. Panel simulations were performed with two fracture criteria: one calibrated based on the test data from dog-bone specimen and other calibrated based on the data from all tensile tests. To evaluate the fracture criteria in terms of their capacity to handle mesh size variations, mesh size was varied from fine to coarse. Results suggest that fracture criterion calibrated based on the range of stress states can handle mesh size variations more effectively as displacement to fracture showed considerably weaker mesh size dependence.

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The toughness of laser welded joints in the ductile–brittle transition

Cited by 52 publications

References 12 publications

Studies on mechanical properties, microstructure and fracture morphology details of laser beam welded thick SS304L plates for fusion reactor applications

Studies on mechanical properties, microstructure and fracture morphology details of laser beam welded thick SS304L plates for fusion reactor applications

Toughness evaluation of EB welds

Experimental and numerical penetration response of laser-welded stiffened panels

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