Experimental research and numerical analysis of welding residual stress of butt welded joint of thick steel plate

Lu, Wenliang; Sun, Jing-Long; Su, Han; Chen, Liang-Jiang; Zhou, Yong-Zheng

doi:10.1016/j.cscm.2023.e01991

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…At the measurement point on Line 3, the tensile stress peak is larger compared to the other two measurement points, reaching 182.703 MPa. As the distance from the weld seam decreases, tensile stress rapidly decreases, displaying an 'M' shaped trend [10] . At the measurement point on Line 2, compressive stress appears at the edge of the weld seam due to the influence of the fixed node.…”

Section: Analysis Of Transverse Residual Stressesmentioning

confidence: 99%

Numerical simulation of efficient welding for thick plates in shipbuilding using simufact welding

Bin,

Liu,

et al. 2024

J. Phys.: Conf. Ser.

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In the welding process of medium-thick plates, it is common to create grooves and perform double-sided multi-pass welding. However, this approach leads to low welding efficiency and high costs. Hence, this study utilizes a groove-free, double-sided double-pass welding method to enhance welding efficiency and decrease shipbuilding expenses. A finite element model of groove-free submerged arc welding for medium-thick plates was established using SolidWorks software, and mesh division was carried out. Subsequently, numerical simulations of high-voltage, high-current double-sided double-pass submerged arc welding for medium-thick plates were conducted using Simufact Welding software. In the simulation, a mobile double ellipsoid heat source was utilized to replicate the dynamic alterations throughout the entire welding process. Subsequently, the temperature field of the welded material was computed. Finally, utilizing the temperature field results, the residual stress distribution within the welded material was computed through the thermal-structural coupling feature. The simulation results revealed a significant temperature gradient at the center of the heat source during the welding process, with a slower temperature change observed behind the heat source. Around 4000 seconds, the weldment cooled to room temperature. At this point, the thermal stress mainly concentrated around the weld seam. This numerical welding simulation serves as a crucial reference for designing welding process parameters and researching residual stress distribution. Consequently, it enhances welding efficiency in the field of shipbuilding.

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Section: Analysis Of Transverse Residual Stressesmentioning

confidence: 99%

Numerical simulation of efficient welding for thick plates in shipbuilding using simufact welding

Bin,

Liu,

et al. 2024

J. Phys.: Conf. Ser.

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“…It is relevant to the evaluation of welding-induced residual stress and distortion in A-TIG welding of duplex stainless steel [23]. The internal and surface residual stresses of the thick plates are symmetrical along the paths perpendicular to the weld seam, with asymmetry occurring in the weld seam and the heat-affected zone where the stress varies [24]. The double-side welding techniques used resulted in residual axial and hoop stresses that were tensile at the inner and outer surfaces of the dissimilar weld joint [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effect of Fusion Welding Processes on Residual Stress in Stainless Steel Pipe Weld Joints Used in Fast Reactors

Ragavendran,

Vasudevan

2023

Engineering Science & Technology

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The main structural material used in the building of Fast Breeder Reactors (FBR) is stainless steel of type 316L(N). Finite Element Model (FEM)-based simulations were carried out to understand the effect of various welding processes on the residual stresses induced in 316L(N) stainless steel primary sodium-carrying pipes with an inner diameter of 208 mm and a wall thickness of 5.6 mm. The welding processes considered include multi-pass Tungsten Inert Gas (TIG) welding, A-TIG, laser, hybrid laser-TIG, and Hybrid laser-Metal Inert Gas (MIG). First, single or hybrid heat sources are chosen based on the welding process, and then weld bead profiles obtained during simulation are made to match with that of the actual weld bead profiles obtained during experiments. Then, the optimised heat source is employed for the thermal analysis. The thermal analysis output is then successively linked and provided as input to the mechanical analysis, which uses an isotropic hardening model to predict hoop and axial residual stresses in pipe weld joints. The results show that the A-TIG weld joint exhibited lower hoop stress (165 MPa at inner diameter and -2 MPa at outer diameter) in comparison with that of the other weld joints. The lower residual stress is attributed due to the straight-sided weld bead, lower peak temperature, and slower cooling rate of the A-TIG welding. Therefore, A-TIG welding is recommended among the chosen fusion welding processes for welding of 316L(N) stainless steel primary sodium carrying pipes to minimise the residual stresses and mitigate the premature failure of the pipe weld joints.

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“…Numerous investigations have been carried out on the fatigue behavior of welded joints [13][14][15], but there is a scarcity of literature that specifically focuses on WHSJs Nevertheless, the fatigue research on WHSJs remains relatively underexplored. Regard ing TSJs, Qin [16] performed finite element analysis on over 50 WHSJs of varying geo metric sizes, investigating the stress distribution at the intersection of steel tubes and hollow spheres.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Fatigue Analysis and Practical Design Methodology for Weld Toes in the Sphere of Welded Hollow Spherical Joints in Grid Structures

Yan,

Guo,

Zhou

2023

Coatings

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This paper addresses the issue of fatigue in grid structures, a topic of interest in engineering and academia. The goal is to establish a practical fatigue design calculation method for weld toes in welded hollow spherical joints (WHSJs). The study focuses on commonly used steel tube-WHSJs in grid structures, conducting 25 constant amplitude and four variable amplitude fatigue tests on tube–sphere joints (TSJs) to derive corresponding S-N curves. Using ANSYS, the hot spot stress concentration coefficient Kh at the weld toes in 22 TSJs was calculated, resulting in a numerical solution for Kh ranging from 2.0550 to 4.8600. Based on this, fatigue design methods were established using nominal stress amplitude and hot spot stress amplitude as fundamental parameters. Within a fatigue design reference period of two million cycles, the allowable nominal stress amplitude for TSJs is 22 N/mm2, and the allowable hot spot stress amplitude is 66 N/mm2. The study also conducted macroscopic and microscopic analyses on fatigue fractures of TSJs, revealing that the weld toe in the sphere of TSJs is the primary site for fatigue crack initiation. This research provides practical calculation methods for fatigue design in WHSJ grid structures, contributing to their broader application.

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Experimental research and numerical analysis of welding residual stress of butt welded joint of thick steel plate

Cited by 7 publications

References 21 publications

Numerical simulation of efficient welding for thick plates in shipbuilding using simufact welding

Numerical simulation of efficient welding for thick plates in shipbuilding using simufact welding

Numerical Simulation of the Effect of Fusion Welding Processes on Residual Stress in Stainless Steel Pipe Weld Joints Used in Fast Reactors

Comprehensive Fatigue Analysis and Practical Design Methodology for Weld Toes in the Sphere of Welded Hollow Spherical Joints in Grid Structures

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