3D FEM Simulation Analysis for the Residual Stress to GTAW Welded Joints Based on Adscititious Magnetic Field

2011 ◽  
Vol 138-139 ◽  
pp. 775-779
Author(s):  
Qi Lin Zhong ◽  
Shu Yuan Jiang ◽  
Huan Ming Chen ◽  
Pin Liu
Keyword(s):  
Magnetic Field ◽  
Residual Stress ◽  
Temperature Gradient ◽  
Welded Joints ◽  
Simulation Analysis ◽  
Fem Simulation ◽  
Welding Residual Stress ◽  
3D Fem ◽  
Welding Pool ◽  
Longitudinal Residual Stress

Aiming at adscititious magnetic field effect GTAW arc, decrease the maximum welding residual which by arc shape be changed, avoid the temperature excessive focus on welding pool, reduce temperature gradient and so on. Arc heat source model of GTAW under the magnetic field was established, also consider physical properties of materials varying with the temperature and the influence transformation, through the method of killing or activating elements treatment such as melting or solidification by welding pool, 3D FEM simulation analysis for the temperature gradient and residual stress size distribution to GTAW welded joints compared to on magnetic field or not. The results show that maximum weld longitudinal residual stress and transverse residual stress were respectively reduced by 12.3% and 13.6% when compared to no magnetic field, also have blind hole measuring method measure welding residual stress, Test measurement and simulation values were basically consistent.

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.

scholarly journals Simplified Analysis of Welding Residual Stress in a Box Structure Fabricated with Plural Welded Joints.

1999 ◽  
Vol 65 (633) ◽  
pp. 989-995 ◽  
Author(s):  
Masahito MOCHIZUKI ◽  
Toshio HATTORI ◽  
Munetoshi ZEN ◽  
Junji YAMAMOTO ◽  
Kimiaki NAKAKADO
Keyword(s):  
Residual Stress ◽  
Welded Joints ◽  
Welding Residual Stress ◽  
Box Structure ◽  
Simplified Analysis

Welding Residual Stress Evaluation of Complex Welded Joints by Brinell Hardness Method

2014 ◽  
Vol 496-500 ◽  
pp. 2444-2451
Author(s):  
Qiang Zeng ◽  
Dai Qin Tao ◽  
Zheng Zhou ◽  
Xiao Qian Li
Keyword(s):  
Residual Stress ◽  
Statistical Analysis ◽  
Base Metal ◽  
Welded Joints ◽  
Brinell Hardness ◽  
Welding Residual Stress ◽  
Stress Evaluation ◽  
Material Hardness

Basing on a giant truss, this passage did a macro assessment of welding resjdual stress by the changes of material hardness which was measured by brinell hardness method after welding. This experiment measured about 1728 measurement points on 72 nodes. Statistical analysis of the hardness data shows that hardness of base metal decreases in the area of HAZ ,and plastic of welded joints increases.

Numerical simulation of the effect of ultrasonic impact treatment on welding residual stress

2021 ◽  
pp. 2150175
Author(s):  
Tao Mo ◽  
Jingqing Chen ◽  
Pengju Zhang ◽  
Wenqian Bai ◽  
Xiao Mu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Compressive Stress ◽  
Welded Joints ◽  
Welding Process ◽  
Residual Compressive Stress ◽  
Welding Residual Stress ◽  
304 Stainless Steel ◽  
Residual Tensile Stress ◽  
Ultrasonic Impact Treatment

Ultrasonic impact treatment (UIT) is an effective method that has been widely applied in welding structure to improve the fatigue properties of materials. It combines mechanical impact and ultrasonic vibration to produce plastic deformation on the weld joints surface, which introduces beneficial compressive residual stress distribution. To evaluate the effect of UIT technology on alleviating the residual stress of welded joints, a novel numerical analysis method based on the inherent strain theory is proposed to simulate the stress superposition of welding and subsequent UIT process of 304 stainless steel. Meanwhile, the experiment according to the process was carried out to verify the simulation of residual stress values before and after UIT. By the results, optimization of UIT application could effectively reduce the residual stress concentration after welding process. Residual tensile stress of welded joints after UIT is transformed into residual compressive stress. UIT formed a residual compressive stress layer with a thickness of about 0.13 mm on the plate. The numerical simulation results are consistent with the experimental results. The work in this paper could provide theoretical basis and technical support for the reasonable evaluation of the ultrasonic impact on residual stress elimination and mechanical properties improvement of welded joints.

Study of residual stresses in A7N01 aluminum alloy with X-ray diffraction Debye ring analysis

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940032 ◽  
Author(s):  
Pengfei Zhu ◽  
Guoqing Gou ◽  
Zhaofu Li ◽  
Minhao Zhu ◽  
Zhongyin Zhu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Welding Residual Stress ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Debye Ring ◽  
Size Stability ◽  
Ring Analysis

The welding residual stress has different effects on the mechanical properties of aluminum alloy welded joints, such as size stability, fatigue strength and stress corrosion cracking. Therefore, it is very important to evaluate the welding residual stress accurately. In this paper, the residual stress of A7N01 aluminum alloy welded joints was measured by X-ray diffraction. In contrast to the traditional method, the cos[Formula: see text] method was used in this paper, the results were compared with those obtained by the conventional [Formula: see text] method. In addition, the influence of oscillation unit on the test results of the cos[Formula: see text] method was studied.

Measurement of Welding Residual Stress by Ultrasonic Technology

2015 ◽  
Vol 750 ◽  
pp. 206-213 ◽  
Author(s):  
Hu Chen ◽  
Jin Dan Zhu ◽  
Yan Xun Xiang
Keyword(s):  
Residual Stress ◽  
Ultrasonic Method ◽  
Ultrasonic Inspection ◽  
Welding Residual Stress ◽  
Ultrasonic Technology ◽  
Longitudinal Residual Stress ◽  
Measurement Results ◽  
Acoustic Elasticity ◽  
Good Repeatability ◽  
Acoustic Travel Time

An ultrasonic method was developed to measure the residual stress in a welded joint based on the modified acoustic-elasticity theory. Phase frequency analysis method was introduced by incombination with shear wave and longitudinal wave. The acoustic-elasticity parameters of joint material was derived by ultrasonic inspection during loading experiment. Transverse and longitudinal residual stress was determined by precisely measuring of short-distance acoustic travel time. The ultrasonic measurement results was confirmed by H&K theory and XRD methods with good repeatability and reliability.

Sign in / Sign up

Export Citation Format

Share Document