A STUDY OF RESIDUAL STRESS IN THE REPAIR WELD OF STAINLESS STEEL CLAD PLATE BY NEUTRON DIFFRACTION MEASUREMENT AND FINITE ELEMENT METHOD

2012 ◽  
Vol 48 (12) ◽  
pp. 1525 ◽  
Author(s):  
Wenchun JIANG ◽  
Wanchuck WOO ◽  
Bingying WANG ◽  
Shandong TU
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Neutron Diffraction ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Stainless Steel Clad Plate ◽  
Element Method

Determination of Repair Weld Residual Stress in a Tube to Tube-Sheet Joint by Neutron Diffraction and the Finite Element Method

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Yun Luo ◽  
Wenchun Jiang ◽  
Dongfeng Chen ◽  
Robert C. Wimpory ◽  
Meijuan Li ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Repair Welding ◽  
Welding Direction ◽  
Element Method

Repair welding is a popular method to repair the leakage zone in tube-to-tubesheet joint of shell-tube heat exchangers. But the repaired residual stresses are generated inevitably and have a great effect on stress corrosion cracking (SCC). In this paper, the effects of repair welding on residual stress were studied by finite element method (FEM) and neutron diffraction measurement. The original weld residual stresses calculated by FEM showed good agreement with neutron diffraction measurement results. After repair welding, the transverse residual stresses change very little while the longitudinal residual stresses are increased in the repair zone. In the nonrepair zone, both the transverse and longitudinal stresses are decreased. The repair welding times have little effect on residual stress distribution. With the increase of welding length and heat input, the residual stresses increase. Repair opposite to the original welding direction is recommended because the opposite welding direction minimizes the residual stresses.

Neutron Diffraction Measurement and Finite Element Method Calculation of Residual Stress of a Heat Treated Steel Pipe

2000 ◽  
Vol 39 (Part 1, No. 12A) ◽  
pp. 6652-6657 ◽  
Author(s):  
Kazuko Inoue ◽  
Hisakazu Kawashima ◽  
Junya Sakaguchi ◽  
Nobuaki Minakawa ◽  
Yoshinori Tsuchiya ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Neutron Diffraction ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Method Calculation ◽  
Treated Steel ◽  
Heat Treated ◽  
Heat Treated Steel

Modeling Residual Stresses in Superduplex Stainless Steel Welded Pipes Using the Finite Element Method

2013 ◽  
Vol 758 ◽  
pp. 1-10
Author(s):  
Fabiano Rezende ◽  
Luís Felipe Guimarães de Souza ◽  
Pedro Manuel Calas Lopes Pacheco
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Residual Stresses ◽  
Welding Process ◽  
Welding Parameters ◽  
Superduplex Stainless Steel ◽  
Mechanical Components ◽  
Element Method

Welding is a complex process where localized and intensive heat is imposed to a piece promoting mechanical and metallurgical changes. Phenomenological aspects of welding process involve couplings among different physical processes and its description is unusually complex. Basically, three couplings are essential: thermal, phase transformation and mechanical phenomena. Welding processes can generate residual stress due to the thermal gradient imposed to the workpiece in association to geometric restrictions. The presence of tensile residual stresses can be especially dangerous to mechanical components submitted to fatigue loadings. The present work regards on study the residual stress in welded superduplex stainless steel pipes using experimental and a numerical analysis. A parametric nonlinear elastoplastic model based on finite element method is used for the evaluation of residual stress in superduplex steel welding. The developed model takes into account the coupling between mechanical and thermal fields and the temperature dependency of the thermomechanical properties. Thermocouples are used to measure the temperature evolution during welding stages. Instrumented hole drilling technique is used for the evaluation of the residual stress after welding process. Experimental data is used to calibrate the numerical model. The methodology is applied to evaluate the behavior of two-pass girth welding (TIG for root pass and SMAW for finishing) in 4 inch diameter seamless tubes of superduplex stainless steel UNS32750. The result shows a good agreement between numerical experimental results. The proposed methodology can be used in complex geometries as a powerful tool to study and adjust welding parameters to minimize the residual stresses on welded mechanical components.

A Parametric Investigation of the Through-Thickness Residual Stresses in the Thick Weld Plate Considering Back Chipping: Neutron Diffraction and Finite Element Method

2019 ◽  
Vol 795 ◽  
pp. 276-281
Author(s):  
Yu Wan ◽  
Wen Chun Jiang ◽  
Jian Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Heat Input ◽  
Plate Thickness ◽  
Diffraction Measurement ◽  
Obvious Effect ◽  
Interpass Temperature ◽  
Element Method

Neutron diffraction and finite element method were combined to analyze the through-thickness residual stresses in the thick weld plate considering back chipping. Large residual stresses were generated near the surface. Furthermore, the effect of back chipping width, the heat input of the back weld after back chipping, interpass temperature and plate thickness on the residual stresses were conducted by finite element method. The results showed that larger back chipping width could be helpful to decrease the risk of stress corrosion crack. With the decrease of heat input, the stress variation becomes more obvious. The interpass temperature has an obvious effect on the longitudinal residual stresses but little effect on the transverse residual stresses. Nevertheless, the plate thickness has little influence on the residual stress distribution law. Based on the finite element method results, a formula focused on the 10-40 mm thick plates was fitted to calculate residual stresses with the change of depth through thickness, which was verified by neutron diffraction measurement.

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