Welding is often used to repair the defects in pressure vessels and piping, but residual stresses are generated inevitably and have a great effect on structure integrity. According to the defect size, different repair depth will be carried out, which leads to different stress state. In this paper, the effect of repair depth on residual stress in 316L stainless steel repair weld has been studied by neutron diffraction measurement and finite element modeling (FEM). The results show that the residual stresses in the deep repair are larger than those in shallow repair weld, because the deep repair involves multipass welding and brings a serious work hardening. In the weld metal, the longitudinal stress has exceeded the yield stress, and increases slightly with the increase of repair depth. In contrast to the longitudinal stress, the transverse stress is more sensitive to the repair depth. With the increase of repair depth, the transverse stress increases and even exceeds the yield strength as the repair depth is 45% of the plate thickness. At the bottom surface of the plate and heat affected zone (HAZ), both the longitudinal and transverse stresses increase as the repair depth increases. It also shows that the mixed hardening model gives the best agreement with the measurement, while isotropic and kinematic hardening models cause an overestimation and underestimation, respectively. Therefore, the mixed hardening model is recommended for the prediction of residual stresses.
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August 2015
Research-Article
Neutron Diffraction Measurement and Numerical Simulation to Study the Effect of Repair Depth on Residual Stress in 316L Stainless Steel Repair Weld
Wenchun Jiang,
Wenchun Jiang
1
College of Chemical Engineering,
e-mail: jiangwenchun@126.com
China University of Petroleum (East China)
,Qingdao 266555
, China
e-mail: jiangwenchun@126.com
1Corresponding author.
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Yun Luo,
Yun Luo
College of Chemical Engineering,
China University of Petroleum (East China)
,Qingdao 266555
, China
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BingYing Wang,
BingYing Wang
College of Mechanical and
Electronic Engineering,
Electronic Engineering,
China University of Petroleum (East China)
, Qingdao 266555
, China
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Wanchuck Woo,
Wanchuck Woo
Neutron Science Division,
Korea Atomic Energy Research Institute
,1045 Daedeok-daero, Yuseong-gu
,Daejeon 305-353
, South Korea
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S. T. Tu
S. T. Tu
Key Laboratory of Pressure System and
Safety (MOE),
School of Mechanical and Power Engineering,
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science and Technology
,Shanghai 200237
, China
Search for other works by this author on:
Wenchun Jiang
College of Chemical Engineering,
e-mail: jiangwenchun@126.com
China University of Petroleum (East China)
,Qingdao 266555
, China
e-mail: jiangwenchun@126.com
Yun Luo
College of Chemical Engineering,
China University of Petroleum (East China)
,Qingdao 266555
, China
BingYing Wang
College of Mechanical and
Electronic Engineering,
Electronic Engineering,
China University of Petroleum (East China)
, Qingdao 266555
, China
Wanchuck Woo
Neutron Science Division,
Korea Atomic Energy Research Institute
,1045 Daedeok-daero, Yuseong-gu
,Daejeon 305-353
, South Korea
S. T. Tu
Key Laboratory of Pressure System and
Safety (MOE),
School of Mechanical and Power Engineering,
Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science and Technology
,Shanghai 200237
, China
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 13, 2014; final manuscript received August 27, 2014; published online February 20, 2015. Assoc. Editor: Marina Ruggles-Wrenn.
J. Pressure Vessel Technol. Aug 2015, 137(4): 041406 (12 pages)
Published Online: August 1, 2015
Article history
Received:
June 13, 2014
Revision Received:
August 27, 2014
Online:
February 20, 2015
Citation
Jiang, W., Luo, Y., Wang, B., Woo, W., and Tu, S. T. (August 1, 2015). "Neutron Diffraction Measurement and Numerical Simulation to Study the Effect of Repair Depth on Residual Stress in 316L Stainless Steel Repair Weld." ASME. J. Pressure Vessel Technol. August 2015; 137(4): 041406. https://doi.org/10.1115/1.4028515
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