Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels

Šebestová, Hana; Horník, Petr; Mrňa, Libor; Jambor, Michal; Horník, Vít; Pokorný, Pavel; Hutař, Pavel; Ambrož, Ondřej; Doležal, Pavel

doi:10.1016/j.msea.2019.138780

Cited by 19 publications

(10 citation statements)

References 18 publications

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“…It is a ferritic-pearlitic (Figure 1) steel having good weldability, low content of carbon, as well as elements such as S and P. Chemical composition of the material determined by the Q4 TASMAN spectrometer is shown in Table 1. The determined chemical composition is in accordance with the standard ČSN EN 10149-2 indicating the chemical composition of structural thermos-mechanically processed steels [4]. Subsequently, the mean grain size of 7.3 µm was determined by the EBSD analysis.…”

Section: Experiments Objectives and Used Materialssupporting

confidence: 57%

“…Subsequently, the mean grain size of 7.3 µm was determined by the EBSD analysis. This is the average value obtained from three measurements of areas 0.6 x 0.6 mm [4]. To assess the mechanical properties under static and dynamic loading, a static tensile test was performed at first and then was determined the Wöhler curve of the base material.…”

Section: Experiments Objectives and Used Materialsmentioning

confidence: 99%

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Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life

Moravec

Novák

Sobotka

et al. 2020

METAL 2020 Conference Proeedings

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Structural designs of the dynamically loaded welded structures are currently based primarily on the values of the parent base material fatigue life. Although it tries to capture the influence of the given process by using the safety constants of the notch effect both of the weld and the thermal influence, it is only a theoretical estimation. Due to that, it very often results in large oversizing and, in worse cases, in under-sizing of the engineering design. As a result, there is either an overly robust and heavy construction, which is unacceptable (especially when applied in the automotive industry) or on the contrary, there is failure of parts due to cracks earlier than their planned service life is reached. The paper shows the effect of MAG welding method on the fatigue life of fillet and butt welds made of the fine-grained structural steel S460MC. The comparison of such influence is performed via using experimentally determined Wöhler curves of the parent material and both types of welded joints.

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Section: Experiments Objectives and Used Materialssupporting

confidence: 57%

Section: Experiments Objectives and Used Materialsmentioning

confidence: 99%

Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life

Moravec

Novák

Sobotka

et al. 2020

METAL 2020 Conference Proeedings

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show abstract

“…Several authors [18][19][20][21][22] have studied the problem of fatigue behaviour of HSLA steel welded joints. Works published in this area differ from each other mainly with respect to the type of steel used, the type of stressed joint, the loading method and in light of the welding technology used.…”

Section: Discussionmentioning

confidence: 99%

“…A lot of very interesting works have also been published in the field of cyclic loading (fatigue testing) of fine-grained HSLA steels. The effect of the heat input value on the changes in the fatigue life of welded joints of steels with yield strengths lower than 550 MPa was investigated by, e.g., Šebestová et al [18] and Moravec et al [19]. The fatigue life of welded joints from steel S700MC and produced using the MAG (Metal Active Gas) method has been studied by Lahtinen et al [20], and the case of steels with higher yield strength has been studied by, e.g., Lago et al [21] and Kim et al [22].…”

Section: Introductionmentioning

confidence: 99%

Assessment the Partial Welding Influences on Fatigue Life of S700MC Steel Fillet Welds

Moravec

Sobotka

Nováková

et al. 2021

Metals

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Fine-grained steels belonging to the HSLA group (High-Strength Low-Alloy steels) of steels are becoming increasingly popular and are used in both statically and dynamically stressed structures. Due to the method of their production, and thus also the method use to obtain the required mechanical properties, it is really necessary to limit the heat input values for these steels during welding. When applying temperature cycles, HSLA steels in highly heated heat-affected zones (HAZ) reveal intensive grain coarsening and also softening behaviour. This subsequently results in changes in both mechanical and brittle-fracture properties, and the fatigue life of welded joints. While grain coarsening and structure softening have a major effect on the change of strength properties and KCV (Charpy V-notch impact toughness) values of statically stressed welded joints, the effect of these changes on the fatigue life of cyclically stressed welded joints has not yet been quantified. The paper is therefore conceived so as to make it possible to assess and determine the percentage impact of individual aspects of the welding process on changes in their fatigue life. To be more specific, the partial effects of angular deformation, changes that occur in the HAZ of weld, and the notch effect due to weld geometry are assessed.

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“…Common welding methods include manual metal arc (MMA) [6], metal active gas (MAG) [7], and self-shielding wire welding [8]. In addition, laser [9], hybrid [10], and friction welding techniques [11] are being developed.…”

Section: Introductionmentioning

confidence: 99%

The influence of welding heat input on the quality and properties of high strength low-alloy dissimilar steel butt joints

Tomków

Haras

2020

Weld. Tech. Rev.

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The paper presents the results of non-destructive and destructive tests od dissimilar high-strength low-alloy S460ML and S460N butt joints. These steels are characterized by similar mechanical properties, but their carbon equivalent CeIIW is much different. The joints were made using different values of heat input for each welding bead. They were tested by non-destructive methods: visual, penetrant, radiographic and ultrasonic tests. Then, the destructive tests were made: static tensile test, bending test, impact test and Vickers HV10 hardness measurements. The results of prepared examinations showed, that welding with higher heat input has significant impact on the mechanical properties of the dissimilar steel joints – the joint welded with bigger heat input was characterized by better mechanical properties.

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Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels

Cited by 19 publications

References 18 publications

Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life

Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life

Assessment the Partial Welding Influences on Fatigue Life of S700MC Steel Fillet Welds

The influence of welding heat input on the quality and properties of high strength low-alloy dissimilar steel butt joints

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