Sub-surface stress measurement of cross welds in a dissimilar welded pressure vessel

Yashar Javadi, Masoud Ashoori

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Manufacturing process of pressure vessels used in high-temperature applications normally needs employing dissimilar metal welds (DMWs) between austenitic and ferritic steel. However, high amount of thermal stresses at the welds are induced due to differences in coefficient of thermal expansion between the types of steel. This study investigates the evaluation of welding residual stresses in a pressure vessel manufactured by DMW of 316 L stainless steel shell to A106 carbon steel caps as well as similar welding of stainless steel shells. By using longitudinal critically refracted (LCR) ultrasonic waves, the residual stresses are experimentally measured. The ultrasonic method is based on acoustoelasticity law by which the ultrasonic wave velocity could be connected to the material stress. By changing the frequency in which the ultrasonic transducers are working, the LCR waves are able to penetrate in various depths of the material in order to measure the sub-surface residual stresses. Hence, four main aspects are considered in this study: (I) stress evaluation of the DMW; (II) sub-surface stress measurement; (III) stress evaluation of longitudinal weld and (IV) stress measurement in cross weld. It is demonstrated that the residual stresses of the DMW pressure vessel could be comprehensively evaluated by using the LCR method.

LanguageEnglish
Pages82-90
Number of pages9
JournalMaterials and Design
Volume85
Early online date7 Jul 2015
DOIs
Publication statusPublished - 15 Nov 2015

Fingerprint

Stress measurement
Surface measurement
Pressure vessels
Welds
Dissimilar metals
Residual stresses
Stainless Steel
Welding
Stainless steel
Ultrasonic velocity
Ultrasonic transducers
High temperature applications
Austenitic steel
Steel
Ultrasonic waves
Ferritic steel
Thermal stress
Carbon steel
Thermal expansion
Elasticity

Keywords

  • acoustoelasticity
  • cross weld
  • dissimilar welding
  • hole-drilling method
  • LCR wave
  • pressure vessel

Cite this

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abstract = "Manufacturing process of pressure vessels used in high-temperature applications normally needs employing dissimilar metal welds (DMWs) between austenitic and ferritic steel. However, high amount of thermal stresses at the welds are induced due to differences in coefficient of thermal expansion between the types of steel. This study investigates the evaluation of welding residual stresses in a pressure vessel manufactured by DMW of 316 L stainless steel shell to A106 carbon steel caps as well as similar welding of stainless steel shells. By using longitudinal critically refracted (LCR) ultrasonic waves, the residual stresses are experimentally measured. The ultrasonic method is based on acoustoelasticity law by which the ultrasonic wave velocity could be connected to the material stress. By changing the frequency in which the ultrasonic transducers are working, the LCR waves are able to penetrate in various depths of the material in order to measure the sub-surface residual stresses. Hence, four main aspects are considered in this study: (I) stress evaluation of the DMW; (II) sub-surface stress measurement; (III) stress evaluation of longitudinal weld and (IV) stress measurement in cross weld. It is demonstrated that the residual stresses of the DMW pressure vessel could be comprehensively evaluated by using the LCR method.",
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Sub-surface stress measurement of cross welds in a dissimilar welded pressure vessel. / Javadi, Yashar; Ashoori, Masoud.

In: Materials and Design, Vol. 85, 15.11.2015, p. 82-90.

Research output: Contribution to journalArticle

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