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research-article

Characterisation 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
zondi@outlook.com

Andrew Venter

Section Leader, Diffraction, NECSA
andrew.venter@nesca.co.za

Deon Marais

Senior Engineer, Neutron Diffraction, NECSA
deon.marais@nesca.co.za

Clinton Bemont

Senior Lecturer, Mechanical Engineering, UKZN
bemontc@ukzn.ac.za

1Corresponding author.

ASME doi:10.1115/1.4037445 History: Received August 29, 2016; Revised July 13, 2017

Abstract

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 adversely affects fatigue life of such structure by reducing fracture toughness. The present study applies the Neutron Diffraction 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 centre 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 literature.

Copyright (c) 2017 by ASME
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