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Research Papers: Materials and Fabrication

Characterization of Welding-Induced Residual Stress Using Neutron Diffraction Technique

[+] Author and Article Information
M. Clyde Zondi

School of Mechanical Engineering,
Howard College,
Durban KZN 4001, South Africa
e-mail: zondi@outlook.com

Andrew Venter

Diffraction,
NECSA,
Pretoria 0001, South Africa
e-mail: Andrew.venter@nesca.co.za

Deon Marais

Neutron Diffraction Section,
NECSA,
Pretoria 0001, South Africa
e-mail: deon.marais@nesca.co.za

Clinton Bemont

School of Mechanical Engineering,
Howard College,
Durban KZN 4001, South Africa
e-mail: bemontc@ukzn.ac.za

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 29, 2016; final manuscript received July 13, 2017; published online October 12, 2017. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 139(6), 061402 (Oct 12, 2017) (8 pages) Paper No: PVT-16-1156; doi: 10.1115/1.4037445 History: Received August 29, 2016; Revised July 13, 2017

Pressure vessels comprise critical plant equipment within industrial operations. The fact that the vessel operates under pressure, and may carry toxic, dangerous, or hazardous contents, necessitates that care is taken to ensure safety of humans operating it and the environment within which it operates. Residual stress developed during welding of pressure vessel structures can adversely affects fatigue life (mean stress effect) of such structure and lead to corrosion crack growth. The present study applies the neutron diffraction (ND) technique to formulate the stress field distribution of a nozzle-to-shell weld joint of a pressure vessel. A number of experiments are conducted using the submerged arc welding (SAW) process at various parametric combinations to develop a number of specimens with different stress profiles. It is shown that the hoop stresses close to the weld center line (WCL) are highly tensile and have values close to the yield strength of the material. The ideal parametric combination is also determined based on the results with lowest stresses. The results obtained in this study are congruent to the results of similar studies in the literature.

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References

Figures

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Fig. 1

Schematic of the Bragg's Principle (Source: Schajer, 2013, Permission granted by Wiley@2010) [4]

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Fig. 2

Weld specimen preparation

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Fig. 3

Stress measurement points

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Fig. 4

Weld specimen mounting for three-dimensional stress measurements

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Fig. 5

Stress profiles for weld specimens

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Fig. 6

Stress profiles for lowest three specimens

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