Deformation heterogeneity in laser-welded Eurofer

Harte, Allan; Dawson, Hana N.; Bowden, David; Spencer, Rory; Kirk, Simon; Gorley, Michael

doi:10.1016/j.fusengdes.2020.111860

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…7a.). These results corroborate well with the literature on LKW Eurofer 97, which report similar values [22]. The observed FZ is $60 % smaller than can be achieved by conventional welding techniques such as tungsten inert gas (TIG) welding [31].…”

Section: Discussionsupporting

confidence: 91%

“…A 3D representation of two 6 mm plates was discretised into 1.1 Â 10 5 tetrahedral heat transfer elements by an adaptive meshing algorithm. The keyhole welding laser as described by UKAEA was represented by a single pass of a moving 6 kW gaussian beam [16,22], and thermophysical properties for Eurofer 97 and efficiencies for the laser-material interaction were taken from the literature (Table 2) [4,23]. Properties for ASTM P91 or P92 steel were substituted where values for Eurofer 97 could not be found [24,25].…”

Section: Finite Element Thermal Analysismentioning

confidence: 99%

“…A representative specimen of LKW Eurofer 97 was fabricated by the United Kingdom Atomic Energy Authority (UKAEA) by buttwelding two 6 mm plates of Eurofer 97 with a single pass of a 6 kW ytterbium fibre laser (k = 1060 nm). The welding apparatus employed had a 0.6 mm diameter spot size and a focal length of 200 mm at the top of the weld, and the welding speed (W s ) was 0.5 m min À1 [16,22]. Several 25 Â 6 Â 1 mm samples were cut perpendicular to the weld centreline using a water-cooled diamond disc saw at a feed rate of 0.05 mm min À1 .…”

Section: Weld Specimen Characterisationmentioning

confidence: 99%

“…To ensure the integrity of these novel welds during service, there is significant interest in both fully characterising their microstructure, and developing microstructural models that can be used to predict their degradation behaviour [20,21]. To-date, research on LKW Eurofer 97 welds has focused on development of the welding process and the post-weld heat treatment (PWHT) [16,22]. This study combines computational modelling techniques with microstructural analysis of a representative LKW Eurofer 97 specimen to explore the microstructure of these novel Eurofer 97 laser welds in new detail, and predict the evolution of Eurofer 97 0 s precipitates during welding.…”

mentioning

confidence: 99%

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Microstructural modelling and characterisation of laser-keyhole welded Eurofer 97

Hargreaves¹,

Moore²,

Yuan³

et al. 2023

Materials & Design

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Section: Discussionsupporting

confidence: 91%

Section: Finite Element Thermal Analysismentioning

confidence: 99%

Section: Weld Specimen Characterisationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Microstructural modelling and characterisation of laser-keyhole welded Eurofer 97

Hargreaves¹,

Moore²,

Yuan³

et al. 2023

Materials & Design

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“…The possibilities reduction of welding residual stresses and deformations were analyzed also in the works [24,25]. Reference [26] analyzes the deformations formed after laser welding. The results of the effect of normalizing treatment on the deformations and microstructure formed have been presented.…”

Section: Introductionmentioning

confidence: 99%

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

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The article presents an innovative method of reducing welding distortions of thin-walled structures by introducing structural and technological changes. The accuracy of the method was demonstrated on the example of welding the stub pipes to the outer surface of a thin-walled tank with large dimensions, made of steel 1.4301 with a wall thickness of 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), distortions of the base are formed, the flatness deviation of which was 11.9 × 10−3 (m) and exceeded the permissible standards. As a result of structural and technological changes, not only does the joint stiffness increase, but also a favorable stress state is introduced in the flange, which reduces the local welding stresses. Numerical models were developed using the finite element method (FEM), which were used to analyze the residual stresses and strains pre-welding, in extruded flanges, in transient, and post-welding. The results of the calculations for various flanges heights show that there is a limit height h = 9.2 × 10−3 (m), above which flange cracks during extrusion. A function for calculating the flange height was developed due to the required stress state. The results of numerical calculations were verified experimentally on a designed and built test stand for extrusion the flange. The results of experimental research confirmed the results of numerical simulations. For further tests, bases with a flange h = 6 × 10−3 (m) were used, to which a stub pipe was welded using the GTAW method. After the welding process, the distortion of the base was measured with the ATOS III scanner (GOM a Zeiss company, Oberkochen, Germany). It has been shown that the developed methodology is correct, and the introduced structural and technological changes result in a favorable reduction of welding stresses and a reduction in the flatness deviation of the base in the welded joint to 0.39 × 10−3 (m), which meets the requirements of the standards.

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Thermomechanical analysis of tungsten-copper joints for fusion applications using digital image correlation

Belrhiti,

Hamelin,

Knowles

et al. 2024

Fusion Engineering and Design

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Deformation heterogeneity in laser-welded Eurofer

Cited by 7 publications

References 40 publications

Microstructural modelling and characterisation of laser-keyhole welded Eurofer 97

Microstructural modelling and characterisation of laser-keyhole welded Eurofer 97

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Thermomechanical analysis of tungsten-copper joints for fusion applications using digital image correlation

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