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Research Papers

Effect of Helix Angle on Hydrogen Diffusion of Spiral Weld Pipe

[+] Author and Article Information
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

Yun Luo, Xiaolei Zhang, W. Y. Zhang

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

Qian Zhang

College of Mechanical and Electronic
Engineering,
China University of Petroleum (East China),
Qingdao 266580, China

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received March 17, 2016; final manuscript received June 21, 2017; published online August 10, 2017. Assoc. Editor: Harley Johnson.

J. Eng. Mater. Technol 140(1), 011009 (Aug 10, 2017) (7 pages) Paper No: MATS-16-1090; doi: 10.1115/1.4037393 History: Received March 17, 2016; Revised June 21, 2017

This paper presents a study of hydrogen diffusion for a spiral weld pipe considering the effect of weld residual stress. The results show that the hydrogen mainly gathers at heat-affected zone (HAZ). HAZ is the weakest zone where hydrogen-induced cracking (HIC) occurs. The effect of helix angle on the hydrogen diffusion is also discussed. It shows that different helix angles generate different hydrogen concentrations. As the helix angle increases, both the hydrogen concentration and residual stresses decrease. As the helix angle increases from 40 deg to 50 deg, the equivalent pressure stresses reduce a little, resulting in the change of hydrogen concentration being small. The smaller the helix angle is, the larger the diffusion rate is. The most suitable helix angle should be optimized at 40–50 deg.

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Figures

Grahic Jump Location
Fig. 1

Schematic for hydrogen permeation device

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Fig. 2

Geometry of spiral pipe

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Fig. 3

Finite element meshing

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Fig. 4

Hydrogen permeation current curve

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Fig. 5

Contours of hydrogen concentration (a) and equivalent pressure stress (b) of the spiral weld pipe

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Fig. 6

Hydrogen concentration (a) and residual stress (b) distribution along P1 and P2

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Fig. 7

Hydrogen concentration along P2 (a) and P3 (b) with different helix angles

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Fig. 8

The equivalent pressure stress distribution along P2 (a) and P3 (b) with different helix angles

Grahic Jump Location
Fig. 9

Hydrogen concentration evolution with time of one node in HAZ with different helix angles

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