Nondestructive evaluation of welding residual stresses in dissimilar welded pipes

Yashar Javadi, Omid Afzali, Mohammadreza Hadizadeh Raeisi, Mehdi Ahmadi Najafabadi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This paper investigates the nondestructive capability of ultrasonic waves in residual stress evaluation of dissimilar welded pipes. Longitudinal critically refracted (L CR ) waves are employed to measure the residual stresses in a pipe-pipe joint of stainless steel 304 and carbon steel A106. Measuring the acoustoelastic constant is usually accomplished through the tensile test which needs cutting the tested material to extract tensile test specimens. However, cutting the tested pipe to complement the nondestructive ultrasonic measurement was not considered here. Instead, a dissimilar welded plate with the same welding specification, joint geometry, thickness and the same dissimilar materials is used to extract tensile test samples. The measured acoustoelastic constant of the plate along with the measured time of flight of the L CR wave on the pipe, are utilized for ultrasonic stress measurement. A finite element model of welding process validated by hole-drilling method is used to verify the ultrasonic results. The results show good agreement between finite element and ultrasonic measurements in the pipe measured without any destructive process.

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalJournal of Nondestructive Evaluation
Volume32
Issue number2
Early online date31 Jan 2013
DOIs
Publication statusPublished - 1 Jun 2013
Externally publishedYes

Keywords

  • acoustoelastic constant
  • dissimilar welding
  • finite element welding simulation
  • L waves
  • nondestructive stress measurement
  • residual Stress

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