Research Papers: Materials and Fabrication

Experimental and Numerical Investigation of Heated Band Width for Local Post Weld Heat Treatment of ASME P92 Steel Pipe

[+] Author and Article Information
Yongdian Han

e-mail: hanyongdian@tju.edu.cn
School of Materials Science and Engineering,
Tianjin University,
Tianjin 300072, China;
Tianjin Key Laboratory of Advanced
Joining Technology,
Tianjin 300072, China

Yunjian Jiang

Hebei Electric Power Research Institute,
Shijiazhuang 050021, China

Jie'an Gao

Tianjin Chengxinda Metal Testing
Technology Co. Ltd,
Tianjin 300384, China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received February 1, 2013; final manuscript received April 27, 2013; published online October 23, 2013. Assoc. Editor: Wolf Reinhardt.

J. Pressure Vessel Technol 136(1), 011401 (Oct 23, 2013) (8 pages) Paper No: PVT-13-1027; doi: 10.1115/1.4024582 History: Received February 01, 2013; Revised April 27, 2013

Local post weld heat treatment (local PWHT) is usually carried out when it is impractical to place the entire component in a furnace or oven, which is an effective way to relax residual stress due to welding. However, there are various international codes or standards that define different criteria for local PWHT and it may bring confusion in engineering applications. In the present study, welding and local PWHT experiments on ASME SA-335 Grade P92 large-diameter pipes were conducted under field conditions. In order to simulate the temperature field distribution of welded joints during the process of local PWHT, a thermal tracking program has been successfully developed using the ansys parametric design language (APDL) and the numerical results agree well with experimental data. Furthermore, a series of pipe models were developed using the finite element method (FEM) and through repeated calculations, optimized numerical values for each pipe's heated band (HB) width and gradient control band (GCB) width were calculated. Through numerical analysis, recommended estimation of heated band width for local PWHT of P92 large-diameter pipes is obtained, which ensures the minimum temperature throughout the soak band.

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Fig. 4

Experimental data of axial temperature field distribution of welded joint at different locations (a) 12:00 position and (b) 6:00 position

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Fig. 5

3D numerical model of P92 pipe

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Fig. 3

Schematic diagram of installation locations and distribution of thermocouples

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Fig. 2

Schematic diagram of the weld geometry

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Fig. 1

Welding and local PWHT profile

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Fig. 6

Simulative results of axial temperature field distribution of welded joint at different locations (a) 12:00 position and (b) 6:00 position

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Fig. 7

Relation between heated band width and parameter Rt

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Fig. 8

Liner fit of a series of data points with R equal to 80, 130, 174.5, and 225 mm, respectively

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Fig. 9

Liner fit of intercept of equation and parameter R




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