Effects of welding process and heat input on residual stresses in multi-pass welds: application of neutron diffraction
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Date
2015-07-19
Journal Title
Journal ISSN
Volume Title
Publisher
ICMS Australasia
Abstract
High strength low alloy (HSLA) steels are widely used in oil & Gas and pressure vessel applications due to their favorable mechanical properties. The need for safe operation of the welded structures has led to an emphasis on fracture and fatigue-related failure assessments for HSLA steels. It is well known that residual stresses and particularly tensile residual stresses are potentially detrimental to the performance of the structures because they may lead to abrupt crack initiation, stress corrosion cracking, fatigue and other structural failures. Therefore controlling and minimizing the residual stress levels in welded structures are crucial for the longevity and safe operation of these structures. Controlling residual stress levels may be achieved through appropriate selection of pre-welding conditions, in-process parameters and post welding treatments. The current study employed neutron diffraction to investigate the effect of heat input and welding process on the distribution of residual stresses in multi-pass weldments. The outcomes of this study indicate that the utilization of welding procedures with higher heat input weld runs is beneficial in the reduction of the residual stresses The experimental results also indicated that the welding process itself has a significant impact on the residual stress levels. The generated experimental data may also be utilized for validation studies of computational modelling and approaches.
Description
Not available online.
Keywords
Alloys, Fracture properties, Neutron diffraction, Residual stresses, Steels, Stress corrosion, Welding
Citation
Alipooramirabad, H., Paradowska, A., Ghomashchi, R., & Reid, M. (2015). Effects of welding process and heat input on residual stresses in multi-pass welds: application of neutron diffraction. Presented at 2nd Asia Oceania Conference on Neutron Scattering (AOCNS) 2015, Novotel Sydney Manly Pacific, Manly, Australia, 19 - 23 Jul 2015 (p. 34)