Application of impact tensile testing to welded thin sheets

Bayraktar, E.; Kaplan, D.; Buirette, C.; Grumbach, Marc

doi:10.1016/s0924-0136(03)00859-8

Cited by 43 publications

(43 citation statements)

References 6 publications

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“…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]. They were carrying out impact tensile testing to eliminate the influence of specimen bending and investigate pure crack initiation.…”

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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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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“…Many researches had been carried out concerning mechanical properties of stainless steel and their welded joints. Bayraktar et al [9][10][11] developed the impact tensile testing technique to study the impact resistance of laser welded thin sheets of different steel grades at different temperatures. The resulted ductile/brittle temperature diagram allows explaining pure damage mechanism of the each part of the welded components in the case of the crash.…”

Section: Introductionmentioning

confidence: 99%

Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

Yan

Li²,

et al. 2012

Acta Mech Sin

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The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316 L dissimilar stainless steel welded joints by CO 2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 10 3 s −1 were obtained by the split Hopkinson tensile bar (SHTB). The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong dependence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The

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“…The impact property of the weld is also needed to be evaluated as it is important for assessing crashworthiness. Bayraktar et al [2] have studied the impact properties of different laser welds using soft steels and reported the ductile brittle transition temperatures. However, the impact property of LWTB using DP and other high-strength steels has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Formability and Mechanical Behavior of Laser-Welded Tailored Blanks Made of Interstitial-Free and Dual-Phase Steels

Chatterjee

Saha

Shome

et al. 2009

Metall Mater Trans A

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An attempt has been made to produce laboratory scale laser-welded tailored blanks (LWTBs) with interstitial-free (IF, 300 MPa) and dual-phase (DP, 590 MPa) steel sheets with a thickness ratio of 2. Microstructures and textures of the base, weld, and heat-affected zones (HAZs) were examined using the scanning electron microscope and electron backscattered diffraction technique. The blanks were deformed using the standard limiting dome height (LDH) test setup, and the forming limit diagrams (FLDs) for base IF, DP, and welded blanks with two different weld orientations were constructed. The findings suggest that the FLD o of the welded blank lies in between that of parent IF and DP steel sheets. The formability of the welded blank is highly influenced by the weld orientation. The location of crack formation in the blanks changed with changing the weld orientation in the blanks. The formation of crack on different locations of the blank has been correlated with the local textural differences.

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Application of impact tensile testing to welded thin sheets

Cited by 43 publications

References 6 publications

Toughness evaluation of EB welds

Toughness evaluation of EB welds

Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

Evaluation of Formability and Mechanical Behavior of Laser-Welded Tailored Blanks Made of Interstitial-Free and Dual-Phase Steels

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