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Research Papers: Materials and Fabrication

Residual Stress in the Welding Joint of Layered Cylindrical Vessels Including the Weld Clad Effect

[+] Author and Article Information
Shugen Xu

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266555, China
e-mail: xsg123@163.com

Chong Wang

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266555, China
e-mail: 327438097@qq.com

Yanling Zhao

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266555, China
e-mail: zhaoyanling98@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 10, 2014; final manuscript received September 18, 2014; published online February 20, 2015. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 137(4), 041405 (Aug 01, 2015) (8 pages) Paper No: PVT-14-1065; doi: 10.1115/1.4028726 History: Received April 10, 2014; Revised September 18, 2014; Online February 20, 2015

Layered cylindrical vessels are widely used in process industries. The weld clad is applied before the girth welding of layered-to-layered sections. In this paper, a numerical method was used to predict residual stresses in a layered-to-layered joint with weld clad. The results showed that high residual stresses were generated in the weld and heat affect zone (HAZ), and a discontinuous stress distribution was generated. The through-wall axial residual stress at the weld centerline (WCL) was predominately tensile. The axial residual stress in each layer at the HAZ demonstrated a bending type distribution. The through-wall hoop residual stress at the WCL was predominately compressive in the V-groove zone, and it was tensile in the U-groove zone. The weld clad can decrease the peak residual stress in the tip of the interlayer gaps.

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References

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Figures

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Fig. 1

Cracks initiated in the welding joint

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Fig. 2

Cracks in the welding joint cross section. The outside diameter and inner diameter of the layered cylinder are 1620 mm and 1400 mm, respectively.

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Fig. 3

Dimensions of the groove and the layers

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Fig. 4

Welding sequence and passes

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Fig. 5

FE mesh within the fusion zone

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Fig. 6

Location of reference paths and boundary conditions

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Fig. 7

Geometrical model of weld to verify the FE analysis

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Fig. 8

A comparison of the hoop (a) and axial residual stress (b) by our FEM and Lee's experiment

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Fig. 9

Temperature contours during the laying of different weld passes: (a) pass 13, (b) pass 20, (c) pass 29, and (d) pass 38 (unit: °C)

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Fig. 10

Welding temperature cycle

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Fig. 11

Residual stress contours: (a) von Mises, (b) S11, (c) S22, and (d) S33 (unit: Pa)

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Fig. 12

Stress distribution along WCL (P1)

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Fig. 13

Stress distribution along HAZ (P4)

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Fig. 14

Stress distribution along inner surface (P2)

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Fig. 15

Stress distribution along outer surface (P3)

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Fig. 16

Locations of the selected nodes

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Fig. 17

Effect of clad weld on residual axial stress

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Fig. 18

Effect of clad weld on residual hoop stress

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