scholarly journals Study on Numerical Analysis of Welding Residual Stress and Welding Deformation Generated in Butt Joint

2003 ◽  
Vol 2003 (194) ◽  
pp. 211-217 ◽  
Author(s):  
Toshio Terasaki ◽  
Daisuke Yamakawa
Keyword(s):  
Residual Stress ◽  
Numerical Analysis ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Welding Deformation

Dynamic Response Analysis of Butt Joint of HTS-A Steel Considering Welding Residual Stresses

2013 ◽  
Vol 423-426 ◽  
pp. 944-950
Author(s):  
Wei Shen ◽  
Ren Jun Yan ◽  
Lin Xu ◽  
Kai Qin ◽  
Xin Yu Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Dynamic Response ◽  
Hot Spot ◽  
Time History ◽  
High Strength ◽  
Simulation Method ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Response Analysis ◽  
Hull Structure

This paper uses both numerical simulation method and experimental research method to study on welding residual stress of high-strength steel of the cone-cylinder hull. Welding is often accompanied by a larger welding residual stress, which directly affects the safety and service life of the hull structure. In order to obtain the distribution of the welding residual stress, the welding procedure was developed by its parameter language by using FE analysis software in this paper. Then the welding residual stress of hot spot region was measured through X-ray nondestructive testing method, and compared it with simulation results. Finally, considering the residual stress as the initial stress, this paper analyzed dynamic response process of the welding structure under combined actions of the welding residual stress and multiaxial loads, which could more accurately determine the stress of welding structure and the location of fatigue risk point. According to the amplitude of damage parameters and strain time-history curve, we can estimate the fatigue life of structure by selecting the corresponding damage models.

Finite Element Analyses of Residual Stresses in Typical Welded Joints Used in Nuclear Power Plants and Comparisons With Experiments

2010 ◽  
Author(s):  
Dean Deng ◽  
Kazuo Ogawa ◽  
Nobuyoshi Yanagida ◽  
Koichi Saito
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Residual Stresses ◽  
Welded Joints ◽  
Nuclear Power ◽  
Power Plants ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Dissimilar Metal ◽  
Water Reactors

Recent discoveries of stress corrosion cracking (SCC) at nickel-based metals in pressurized water reactors (PWRs) and boiling water reactors (BWRs) have raised concerns about safety and integrity of plant components. It has been recognized that welding residual stress is an important factor causing the issue of SCC in a weldment. In this study, both numerical simulation technology and experimental method were employed to investigate the characteristics of welding residual stress distribution in several typical welded joints, which are used in nuclear power plants. These joints include a thick plate butt-welded Alloy 600 joint, a dissimilar metal J-groove set-in joint and a dissimilar metal girth-butt joint. First of all, numerical simulation technology was used to predict welding residual stresses in these three joints, and the influence of heat source model on welding residual stress was examined. Meanwhile, the influence of other thermal processes such as cladding, buttering and heat treatment on the final residual stresses in the dissimilar metal girth-butt joint was also clarified. Secondly, we also measured the residual stresses in three corresponding mock-ups. Finally, the comparisons of the simulation results and the measured data have shed light on how to effectively simulate welding residual stress in these typical joints.

Investigation of welding residual stress in flash-butt joint of U71Mn rail steel by numerical simulation and experiment

2015 ◽  
Vol 88 ◽  
pp. 1296-1309 ◽  
Author(s):  
Ninshu Ma ◽  
Zhipeng Cai ◽  
Hui Huang ◽  
Dean Deng ◽  
Hidekazu Murakawa ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Rail Steel ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Simulation And Experiment

Measurement and Numerical Analysis of Welding Residual Stress in Box Structure Employed for Breeder Blanket System of Iter

2011 ◽  
Vol 55 (11-12) ◽  
pp. 48-55 ◽  
Author(s):  
Hisashi Serizawa ◽  
Shinichiro Nakamura ◽  
Hiroyasu Tanigawa ◽  
Takanori Hirose ◽  
Mikio Enoeda ◽  
...  
Keyword(s):  
Residual Stress ◽  
Numerical Analysis ◽  
Welding Residual Stress ◽  
Box Structure

An Experimental Study on Improved Production Process of Large-Diameter Cylinder Assembly

2013 ◽  
Vol 427-429 ◽  
pp. 200-203
Author(s):  
Hui Fan Zeng
Keyword(s):  
Residual Stress ◽  
Large Diameter ◽  
Aging Treatment ◽  
Dimensional Accuracy ◽  
Welding Residual Stress ◽  
Production Cycle ◽  
Welding Deformation ◽  
Residual Stress State ◽  
Deformation Law ◽  
Large Cylinder

Post-welding annealing and aging treatment are commonly used to reduce welding residual stress and post-welding deformation. However, both show their limited effect in the application of large workpieces. Present study attempts to explore the residual stress state and post-welding deformation law of large workpieces by improving the production technology of the important workpieces of certain engineering equipment a large cylinder assembly. It is proposed that the deformation induced by post-welding residual stress can be effectively compensated by increasing the dimensional accuracy in cutting processing. In this way, aging process is replaced and qualified products can be obtained in a much shorter production cycle.

Numerical Analysis of Residual Stresses in Hyperbaric Welding

2012 ◽  
Author(s):  
Xiaobo Ren ◽  
Odd M. Akselsen ◽  
Sigmund K. Ås ◽  
Bård Nyhus
Keyword(s):  
Residual Stress ◽  
Numerical Analysis ◽  
Residual Stresses ◽  
Pressure Range ◽  
Structural Integrity ◽  
Sea Water ◽  
Welding Residual Stress ◽  
Transformation Plasticity ◽  
Micro Structure ◽  
Welding Procedure

Hyperbaric welding residual stress is one of the main concerns for deep water operation. This study presents the numerical investigation of residual stresses in hyperbaric welding by using WeldsimS code. The pressure range investigated in this study is from 3 to 35 bar, which corresponds to 30 to 350 msw (Meters of Sea Water). Experiments results indicate that the welding procedure might be significantly influenced within the pressure range studied. A 2D axisymmetric model has been considered in this study to simulate circumferential welding of a pipe. Phase transformations and transformation plasticity during the welding procedure have been taken into account. The main aim of the study is to predict the hyperbaric welding residual stresses. The temperature evolution and the micro-structure were also studied. Results show that residual stresses induced by hyperbaric welding are significant within the pressure range investigated, which should be assessed for the sake of structural integrity.

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