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SPECIAL SECTION PAPERS: Materials and Fabrication

Experimental and Numerical Study on the Reduction of Residual Stress in the Fillet Weld by Overlay Welding and Cutting Method

[+] Author and Article Information
Yun Luo, Qian Zhang, Yu Wan, W. Y. Zhang, Y. J. Wang

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

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 4, 2015; final manuscript received April 17, 2016; published online July 22, 2016. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 138(6), 061401 (Jul 22, 2016) (7 pages) Paper No: PVT-15-1034; doi: 10.1115/1.4033529 History: Received March 04, 2015; Revised April 17, 2016

Fillet weld joint is widely used in engineering structures, but a lot of failures have been generated in the fillet joint affected greatly by weld residual stress, and it is very important to decrease the residual stress. Therefore, this paper proposes a new method using overlay welding and cutting (OWC) to reduce the residual stress in the fillet weld. First, the overlay welding is applied on the root surface of fillet weld, and then the overlaid metal is removed again by cutting. In order to verify this method, a thermal-elasto-plastic analysis method, using finite-element analysis (FEA) techniques, is developed to evaluate the residual stress change during the process of OWC. The impact indention measurement is also used to measure the surface residual stress. The results of FEA were compared with experimental data to confirm the accuracy of the developed finite-element method (FEM). In order to provide a guideline for design, the dimension effects including overlay weld width and height on residual stress have been investigated. It finds that OWC can decrease 25–40% of the as-weld residual stress, and increasing the overlay width and height is helpful to decrease the residual stress, which provides a reference for the reduction of residual stress in the fillet weld.

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Figures

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Fig. 1

Nozzle welding on pressure vessel (a), model with OWC (b), and cutting (c)

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Fig. 2

Geometrical model of fillet weld joint with OWC (a) and without OWC (b)

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Fig. 3

Specimen (a), measurement positions with OWC (b), and without OWC (c)

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Fig. 4

The impact indention measurement

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Fig. 5

Material properties of 316L stainless steel

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Fig. 6

FE meshing with OWC (a) and without OWC (b)

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Fig. 7

Contour of longitudinal (a) and transverse stresses (b) with and without OWC on the middle cross section

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Fig. 8

Contour of longitudinal (a) and transverse stresses (b) on the bottom surface with and without OWC

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Fig. 9

Longitudinal (a) and transverse (b) stress along P1 between FEM and experiment

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Fig. 10

Comparison of residual stress with and without OWC along P2

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Fig. 11

Comparison of residual stress with and without OWC along P3

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Fig. 12

The temperature history curve and residual stress history curve

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Fig. 13

Residual stress and equivalent plastic strain distribution along path P4

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Fig. 14

Effect of overlay width on residual stress along path P4

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Fig. 15

Effect of overlay height on residual stress along path P4

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