Abstract
Residual stresses occur in every welded manufactured structure. Different studies aimed to classify the methods of investigating the residual stresses and to highlight the advantages and disadvantages/limits of each of them. The conclusion is that ultrasonic investigation permits the evaluation of bulk stress state of welded components with acceptable accuracy. Our past research has addressed various aspects of ultrasonic investigation of residual stresses in welded steel parts: different cases of the analysis of residual stresses, edge effect on analyses of residual stresses. The purpose of this paper is to continue the previous research by introducing a new case: comparative study of equal size samples obtained by splitting an initial sample. The probe was conceived as a frame with a detachable side. After welding, the assembly is processed on a grinding machine to ensure parallel surfaces. The sample, as obtained, is ultrasonic investigated as part. After that, the detachable side is removed and the resulted part is split in six equal samples. Every so obtained sample was investigated and results are presented. New direction for future research is proposed.
Highlights
Residual stresses occur in every welded manufactured structure
This paper aims to investigate the mode of distribution of residual stresses in identical samples obtained by splitting, perpendicular to the welding line, of an initially welded sample
As mentioned above the points of interest marked as series of points A1, A2, A3, A4, A5, A6, A7; B1, B2, B3, B4, B5, B6, B7; C1, C2, C3, C4, C5, C6, C7 were investigated for every samples P1-P6 in state charged
Summary
Residual stresses occur in every welded manufactured structure. Many investigations have been carried out to study this phenomenon. Different studies aimed to classify the methods of investigating the residual stresses and to highlight the advantages and disadvantages/limits of each of them [1-10]. Our past research has addressed various aspects of ultrasonic investigation of residual stresses in welded steel parts: different cases of the analysis of residual stresses, edge effect on analyses of residual stresses [11, 12]. Observations made during experiments opened up new investigative directions. For example, edge effect we used samples of different thicknesses and we noticed an interesting distribution of stresses in the samples obtained by splitting an initial sample
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