Numerical and experimental investigation of the formation mechanism and the distribution of the welding residual stress induced by the hybrid laser arc welding of AH36 steel in a butt joint configuration

2020 ◽  
Vol 51 ◽  
pp. 95-108 ◽  
Author(s):  
Hongjie Zhang ◽  
Yong Wang ◽  
Tao Han ◽  
Liangliang Bao ◽  
Qian Wu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Experimental Investigation ◽  
Formation Mechanism ◽  
Arc Welding ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Hybrid Laser Arc Welding ◽  
Joint Configuration

Finite element analysis of residual stress in hybrid laser-arc welding for butt joint of 12 mm-thick steel plate

2018 ◽  
Vol 62 (2) ◽  
pp. 289-300 ◽  
Author(s):  
Guoxiang Xu ◽  
Haichao Pan ◽  
Peng Liu ◽  
Pengfei Li ◽  
Qingxian Hu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Arc Welding ◽  
Steel Plate ◽  
Butt Joint ◽  
Element Analysis ◽  
Hybrid Laser Arc Welding ◽  
Thick Steel

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

Formation Mechanism of Hydrogen-Induced Delayed Cracking in Weld Center of High-Strength Steel

2012 ◽  
Vol 557-559 ◽  
pp. 1304-1307 ◽  
Author(s):  
Jing Qiang Zhang ◽  
Jian Guo Yang ◽  
Jia Jie Wang ◽  
Xue Song Liu ◽  
Zhi Bo Dong ◽  
...  
Keyword(s):  
Residual Stress ◽  
Formation Mechanism ◽  
Welded Joints ◽  
High Strength Steel ◽  
Hydrogen Pressure ◽  
High Strength ◽  
Welding Residual Stress ◽  
Cracking Behavior ◽  
Hydrogen Damage ◽  
Delayed Cracking

Based on the estimation of the critical hydrogen pressure and concentrations required for hydrogen-induced delayed cracking in high-strength steel, the conclusion that welded joints are hydrogen pressure microcracks body can be drawn under certain conditions. Through the analysis of the relationship between the microstructure evolution of welded joints, diffusion enrichment of hydrogen and cracking behavior, the formation mechanism of hydrogen-induced delayed cracking in weld center of high-strength steel joints is analyzed and the mechanism that stress induced the residual diffusion hydrogen gathered to promote the hydrogen pressure microcracks propagation is proposed. The research shows that the initation and propogation of hydrogen-induced delayed cracking in weld center can be divided into two stages, i.e. irreversible hydrogen damage stage and reversible hydrogen damage stage. In irreversible stage hydrogen pressure is the main causes of the initation of microcracks, while in reversible stage welding residual stress and residual diffusible hydrogen are necessary conditions for microcracks growth. The microcracks growth can be controlled by regulating welding residual stress.

Influence of welding residual stress on cryogenic materials applied to LNG fuel tanks for coastal vessels

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040031
Author(s):  
Tae-Yeob Kim ◽  
Je-Hyoung Cho ◽  
Sung-Won Yoon ◽  
Myung-Hyun Kim
Keyword(s):  
Residual Stress ◽  
Arc Welding ◽  
Local Buckling ◽  
Corrosion Damage ◽  
Fuel Tank ◽  
Welding Residual Stress ◽  
Fuel Tanks ◽  
Fundamental Research ◽  
Lng Fuel ◽  
Transient Thermal

The purpose of this paper is to investigate the influence of welding residual stress (WRS) of the liquefied natural gas (LNG) fuel tank. In general, WRS and distortions are caused by non-uniform temperature distribution by the welding heat source. This will not only cause a brittle fracture, local buckling and corrosion damage, but also adversely affect the fatigue strength of the welded structures. Since LNG is treated at cryogenic temperatures of −162[Formula: see text]C, leakage of LNG from the fuel tank to the outside may cause cracks in the hull and tank support system and cause severe damage. Therefore, it is necessary to predict the thermal behavior and WRS before welding is carried out. In this study, the WRS is calculated by thermal stress analysis based on the temperature distributions over time obtained from the transient thermal analysis. The results of this study can be used as a fundamental research for WRS analysis of plasma arc welding applied to LNG fuel tanks for coastal vessels.

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