A primary plus secondary local PWHT method for mitigating weld residual stresses in pressure vessels

Jin, Qiang; Jiang, Wenchun; Gu, Wenbin; Wang, Jinguang; Li, Gang; Pan, Xiaodong; Song, Ming; Zhang, Kai; Wu, Aibing; Tu, Shan‐Tung

doi:10.1016/j.ijpvp.2021.104431

Cited by 25 publications

(12 citation statements)

References 26 publications

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“…Based on Figure 2, it is easy to conclude increasing the weld leg size and penetration can avoid the weld root failure. Nevertheless, structural light‐weighting has recently attracted extensive attention, and oversized welding elimination plays a crucial role in lightweight structure manufacturing, which can reduce the cost and mitigate the welding‐induced residual stress and distortions 8–10 . As a result, the criterion is highly desirable to quantitatively determine the minimum weld leg and penetration size to avoid root failure with a certain confidence level.…”

Section: Experiments Data Of Lcfwjsmentioning

confidence: 99%

“…The major challenge in assessing the fatigue behavior of welded structures is that the “local” stress or strain at the weld location is usually ill‐defined or singular due to the sharp notch at the weld toe or root 6–10 . It also leads to mesh sensitivity in stress determination through finite element analysis 11 .…”

Section: Introductionmentioning

confidence: 99%

“…The major challenge in assessing the fatigue behavior of welded structures is that the "local" stress or strain at the weld location is usually ill-defined or singular due to the sharp notch at the weld toe or root. [6][7][8][9][10] It also leads to mesh sensitivity in stress determination through finite element analysis. 11 To address this problem, researchers came up with different fatigue parameters other than the local stress to characterize the fatigue behavior of the weldments.…”

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confidence: 99%

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A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

Zhao

Zhang

Song

et al. 2022

Fatigue Fract Eng Mat Struct

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Weld toe and weld root failures dominate the fatigue failures of the loadcarrying cruciform fillet welded joints. Compared to weld toe failure, the weld root failure is strongly affected by its inherent weld quality and throat size, which is more unpredictable and should be eliminated. This work proposes a weld sizing criterion in terms of two weld leg sizes and weld penetration to avoid root failure. The criterion is obtained by a data-driven approach with the help of the mechanical-directed data augmentation technique. The tractionstress-based method is applied for the data augmentation to identify the fatigue failure mode, which is statistically tested against 372 experimentally obtained fatigue data.cruciform joint, data augmentation, data driven, weld root failure, weld sizing | INTRODUCTIONThe load-carrying cruciform fillet welded joint (LCFWJ) is broadly applied to connect secondary components to main members in metal structures. [1][2][3] Two failure modes dominate the fatigue fractures of LCFWJ, namely, weld toe and root failure, depending on the load conditions and the joint geometry, as illustrated in Figure 1. Fatigue crack initiating from the weld root and propagating into the fillet weld is referred to as weld root failure, which should be eliminated during the design stage of the welded structures because of two reasons. (1) Fatigue lives according to weld root failure is usually much lower than that associated with weld toe failure. As stipulated in EN-1993-1-9, 4 the S-N curve recommended for weld root failure falls into the worst possible category, namely, FAT36, which is lower than that of the weld toe failure. 5 Ziqi Zhao and Tairui Zhang contributed equally to this work and should be considered co-first authors.

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Section: Experiments Data Of Lcfwjsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

Zhao

Zhang

Song

et al. 2022

Fatigue Fract Eng Mat Struct

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“…32,33 Furthermore, the participation strain is obtained by the relationship between elastic strain and strain increment, and the original residual stress is calculated by Hooke's law. 34 The schematic diagram of the measurement mechanism is shown in Figure 3B.…”

Section: Residual Stress Measurementmentioning

confidence: 99%

Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

Zheng

Luo

Jiang

et al. 2022

Fatigue Fract Eng Mat Struct

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The cruciform welded joint is a weak position of filter press to cause fatigue failure under cyclic conditions. In this study, cavitation jet peening (CJP) treatment is proposed to improve the fatigue life of SAF2205 cruciform welded joints. The effects of different CJP treatment positions on the residual stress, microstructure, and microhardness were studied. The results show that different CJP treatment positions have different on residual stresses and fatigue life. The order of the residual stress in fracture position from large to small is the fully treated specimen, untreated specimen, one-sided treated specimen, and diagonal treated specimen, which is exactly opposite to the order of fatigue life from large to small. After the diagonal CJP treatment, the fatigue life is increased by up to 242.19%, and the residual stress at the weld toe is reduced by more than 80%. A strengthening layer with thicknesses of about 400 μm is formed.

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“…However, welding residual stresses are inevitably found in the weld-and heat-affected zone. [1][2] Welding residual stresses are one of the main factors to induce stress corrosion cracking or fatigue failure. 2,3 Reduction of welding residual stresses is important to the safety service of welded equipment.…”

Section: Introductionmentioning

confidence: 99%

A new calculation formula to describe the dynamic pressure of water jet peening with elliptical nozzle for high-efficiency treatment

Zheng

Luo

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Water jet peening is a good potential method to control welding residual stresses. The water jet with elliptical nozzle can improve the treatment efficiency due to its large treatment area. In this article, the water jet velocity and dynamic pressure for different elliptical nozzle dimensions and standoff distances are discussed by numerical simulation. The results show that when the axial distance is 10 mm, the effective impact diameter of the elliptical nozzle a/b=8–12 is about 2 times or more than that of the circular nozzle. The length of the jet core of the elliptical nozzle is only related to the outlet structure and is independent of the inlet pressure. The correlation between the dimensionless core length of the elliptical water jet and its long and short axes is derived. When the ratio of the major axis to the minor axis is between 7 and 13, the core length of the elliptical water jet is 7–7.5 times that of its minor axis. Combining the suitable treatment area and dynamic pressure, the elliptical nozzle with an axis ratio of 8 is recommended to control the welding residual stress. Finally, a new formula for calculating dynamic pressure distribution is proposed for the elliptical nozzle water jet at different stages.

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A primary plus secondary local PWHT method for mitigating weld residual stresses in pressure vessels

Cited by 25 publications

References 26 publications

A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

A data‐driven analysis for fatigue failure mode identification in load‐carrying fillet welded joint with mechanical data augmentation

Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

A new calculation formula to describe the dynamic pressure of water jet peening with elliptical nozzle for high-efficiency treatment

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