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JWJ > Volume 39(2); 2021 > Article
Journal of Welding and Joining 2021 April;39(2) :144-149.
Published online April 23, 2021.
doi:https://doi.org/10.5781/JWJ.2021.39.2.2
Residual Stress Study of High Manganese Steel Riser Pipe Manufactured by Longitudinal Butt Welding (2) : Equation for Predicting Welding Induced Residual Stresses Established through Parametric Study
Myung-Su Yi*, Jung-Kwan Seo**,***
*Faculty of Smart Vehicle System Engineering, Chosun University, Gwangju, 61452, Korea
**,***Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, 46241, Korea
The Korea Ship and Offshore Research Institute (The Lloyd’s Register Foundation Research Centre of Excellence), Pusan National University, Busan, 46241, Korea
Correspondence: Myung-Su Yi  Email: true413@chosun.ac.kr
Received April 4, 2021  Revised April 13, 2021  Accepted April 20, 2021  Published online April 23, 2021
ABSTRACT
In recent years, the deep and ultra-deep seas are recognized as the last remaining regions on the planet where oil and natural gas resources are discovered and produced. In order to develop such natural resources in an environmentally safe and cost-effective method, various engineering systems and technologies are being developed. In keeping with this direction of development, there is significant worldwide interest among major offshore structural and system operators in examining the possibility of using high-strength steel for long-distance gas transmission pipelines and risers. In particular, riser pipes using high manganese steel are often made by longitudinal butt welding, but studies related to the prediction of residual stresses for this are insufficient. In general, it is known that in a cylindrical structure such as steel catenary risers (Hereafter, ‘SCRs’), residual stress in the through-thickness direction can be decomposed into a membrane component and a bending component. In this paper, a parametric study through nonlinear finite element analysis was performed to predict the residual stress for each direction of a longitudinal butt-welded riser by considering the main parameters (r/t) of the pipe that can affect the actual residual stress. A new predicting equation for estimating the residual stress profile was proposed using the results of a number of parametric precision numerical analysis derived through this process.
Keywords: Riser | High manganese steel | Longitudinal butt welding | Residual stress | FEA | Parametric study | Through-thickness | Membrane stress | Bending stress | Self-equilibrium stress | Empirical formulae
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Residual Stress Study of High Manganese Steel Riser Pipe Manufactured by Longitudinal Butt Welding (1) : Residual Stress Measurement and FE Analysis  2021 April;39(2)
Residual Stress Study of High Manganese Steel Riser Pipe Manufactured by Longitudinal Butt Welding (1) : Residual Stress Measurement and FE Analysis  2021 April;39(2)
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