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Research Papers: Materials and Fabrication

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

[+] Author and Article Information
Yun Luo

State Key Laboratory of Heavy Oil Processing,
College of Chemical Engineering,
China University of Petroleum (East China),
Qingdao 266580, China

Wenchun Jiang

State Key Laboratory of Heavy Oil Processing,
College of Chemical Engineering,
China University of Petroleum (East China),
Qingdao 266580, China
e-mail: jiangwenchun@126.com

Dongfeng Chen, Meijuan Li

Department of Nuclear Physics,
China Institute of Atomic Energy,
Beijing 102413, China

Robert C. Wimpory

Helmholtz Centre Berlin for Materials
and Energy,
Hahn Meitner Platz 1,
Berlin 14109, Germany

Xiaolong Liu

Department of Nuclear Physics,
China Institute of Atomic Energy,
Beijing 102413, China
e-mail: liuxiaolong@ciae.ac.cn

1Corresponding authors.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 14, 2017; final manuscript received December 28, 2017; published online February 20, 2018. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 140(2), 021404 (Feb 20, 2018) (8 pages) Paper No: PVT-17-1152; doi: 10.1115/1.4039069 History: Received August 14, 2017; Revised December 28, 2017

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.

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References

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Figures

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Fig. 1

A sample of repair weld on tube to tubesheet joint

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Fig. 2

The geometric sketching of tube to tubesheet joint

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Fig. 3

The position of repair welding (a) and measurement point (b)

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Fig. 4

The tube to tubesheet joint (a) and finite element meshing (b)

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Fig. 5

A flow chart of analysis procedure

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Fig. 6

Original as-weld residual stress along P1 (a), P2 (b), and P3 (c)

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Fig. 7

Contour of transverse residual stress before (a) and after repair welding (b)

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Fig. 8

Contour of longitudinal residual stress before (a) and after repair welding (b)

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Fig. 9

The residual stress along P1 (a), P2 (b), and P3 (c) before and after repair welding

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Fig. 10

The variation of transverse (a) and longitudinal stress (b) in weld root along P4 before and after repair welding

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Fig. 11

Effect of repair welding times on longitudinal stress in weld and HAZ along P3

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Fig. 12

Contour of maximum principal stress in joint section for as-weld state (a), once repair (b), twice repair (c), and three time repair (d)

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Fig. 13

Effect of repair welding length on longitudinal stress in weld and HAZ along P3

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Fig. 14

Effect of repair welding direction on longitudinal stress in weld and HAZ along P3

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Fig. 15

Effect of heat input on longitudinal stress in weld and HAZ along P3 (a) and weld root along P4 (b)

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