Numerical investigation on the variation of welding stresses after material removal from a thick titanium alloy plate joined by electron beam welding

Liu, Chuan; Zhang, Jianxun; Wu, Bing; Gong, Shuili

doi:10.1016/j.matdes.2011.05.014

Cited by 35 publications

(12 citation statements)

References 22 publications

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“…But the secondary residual stress redistributions in the specimens were not measured before the Charpy impact test began. It is because Liu et al [8] reported the variation pattern of the through thickness redistributed transverse residual stresses is similar to that of the as-weld residual stress with material removed from the thickness, and the magnitude of residual stresses is decreased slightly. In this light, we assumed that the variation pattern of redistributed transverse residual stresses in the samples (obtained by cutting after welding) is similar to that in the specimens (obtained by cutting and milling after welding), and a change in the redistributed residual stresses is insignificant if a small part of the sample thickness is removed by milling.…”

Section: Preparation Of Samples and Specimensmentioning

confidence: 83%

“…They reported that the minimum cutting length to avoid the stress relaxation by cutting was approximately 6 times the characteristic length (66 mm) and about 12 times the plate thickness (25 mm). Liu et al [8] performed a numerical and experimental study of welding residual stress redistribution of TA15 titanium plates joined by EWB. They reported that the transverse stress on the newlyformed surface decreased significantly, as compared to the aswelded stresses measured at the same locations when material on the top and bottom was removed.…”

Section: Introductionmentioning

confidence: 99%

“…These studies [1][2][3][4][5][6][7][8] did not draw a connection between the residual stress redistribution induced by cutting and machining and variations in the resistance-to-fracture of the weld zone. If the residual stresses redistributed in the preparation of the specimens are not understood, their effect on the resistance-tofracture of the weld zone cannot be investigated thoroughly.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on variations in charpy impact energies of low carbon steel, depending on welding and specimen cutting method

2016

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This paper presents an experimental study that examines variations of Charpy impact energy of a welded steel plate, depending upon the welding method and the method for obtaining the Charpy specimens. Flux cored arc welding (FCAW) and Gas tungsten arc welding (GTAW) were employed to weld an SA516 Gr. 70 steel plate. The methods of wire cutting and water-jet cutting were adopted to take samples from the welded plate. The samples were machined according to the recommendations of ASTM SEC. II SA370, in order to fit the specimen dimension that the Charpy impact test requires. An X-ray diffraction (XRD) method was used to measure the as-weld residual stress and its redistribution after the samples were cut. The Charpy impact energy of specimens was considerably dependent on the cutting methods and locations in the welded plate where the specimens were taken. The specimens that were cut by water jet followed by FCAW have the greatest resistance-to-fracture (Charpy impact energy). Regardless of which welding method was used, redistributed transverse residual stress becomes compressive when the specimens are prepared using water-jet cutting. Meanwhile, redistributed transverse residual stress becomes tensile when the specimens are prepared using wire cutting.

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Section: Preparation Of Samples and Specimensmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on variations in charpy impact energies of low carbon steel, depending on welding and specimen cutting method

2016

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“…12 In Liu's work, vacuum electron beam welding for TA15 titanium alloy, using a zonal cone heat source model, compares experiment and numerical simulation of the residual stresses distribution. 13 In Zhou's investigation, the change of welding direction has different effects on the distribution of residual deformation. The final deformation distribution and deflection parallel to the weld seam are nearly unaffected by the welding direction.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the microstructure and mechanical properties of Ti6Al4V titanium alloy electron beam welding joint

Zhao

Lü

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Electron beam welding (EBW) is a fusion joining process particularly suitable for welding titanium plates. In the present work, 2.5 mm thickness Ti6Al4V titanium alloy plates were butt-welded together with backing plates by EBW. The detailed procedures of experiments were used to investigate the microstructure and mechanical properties of welded joints. The optimum welding speed was determined by microstructure examinations, microhardness tests, X-Ray diffraction tests, shear punch tests (SPT) and stress simulation calculations. The results showed that all microstructure of welded metal (WM) was martensite phase under the different welding speeds. In the heat-affected zone (HAZ), the martensite phase gradually evolved to be small and equiaxed. It can be seen that the microstructure of each region in welded joints did not change significantly. When the welding speed is between 8 mm/s and 14 mm/s, it can be seen from the macroscopic appearance of the joints that there was no utterly fused penetration between the butt plate and substrate. Finite element simulation was carried out for the no-penetration depth under different welding conditions, and it was found that the stress suffered by the small no-penetration depth was the smallest. Using different welding parameters shows that the engineering stress in WM was higher than other areas, and BM was the lowest. As welding speed increases from 8 mm/s to 14 mm/s, the variation of microhardness distribution was not evident.

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“…2 Experimental measurement of residual stress during welding has some practical limitations, and the experimental measurement can be conducted commonly after the whole welding process has been complete or after post-weld heat treatment (PWHT). 3,4 Owing to the relatively large wall thickness in nuclear rotor piping systems, the welded joints are often constructed of a large number of weld passes. At this time, it is difficult to determine the distribution and evolution of residual stress states during welding by experiment.…”

Section: Introductionmentioning

confidence: 99%

Effect of pass increasing on interpass stress evolution in nuclear rotor pipes

Tan

Zhang

2016

Science and Technology of Welding and Joining

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The purpose of this study is to investigate the evolution of residual stress during designing a 89-pass narrow gap welding of nuclear rotor pipes. A two-dimensional finite element model is employed to calculate the residual stress in welding process and heat treatment process, and then the evolution of residual stress during the welding process was discussed in detail. The investigated results show that the overall trend of hoop stress on the inner surface decreases gradually before pass 30, while the trend remains unchanged after pass 30. The through wall axial residual stress at the weld centreline demonstrates a distribution of bending type before pass 38, while this bending type distribution turns into a clearly self-equilibrating type after pass 38.

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Numerical investigation on the variation of welding stresses after material removal from a thick titanium alloy plate joined by electron beam welding

Cited by 35 publications

References 22 publications

Experimental study on variations in charpy impact energies of low carbon steel, depending on welding and specimen cutting method

Experimental study on variations in charpy impact energies of low carbon steel, depending on welding and specimen cutting method

Investigation on the microstructure and mechanical properties of Ti6Al4V titanium alloy electron beam welding joint

Effect of pass increasing on interpass stress evolution in nuclear rotor pipes

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