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Evaluation of Acoustic Emission Signals Characteristics of Post Weld Heat Treated Multi-Pass Weld Block for SA-516 Pressure Vesssel Steel  

Na, Eui-Gyun (School of Mechanical and Automotive Engineering Department, Engineering College, Kunsan National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.5, 2011 , pp. 529-535 More about this Journal
Abstract
In this study, evaluation of acoustic emission signals characteristics for the post weld heat treated (PWHT) multi-pass weldment and weldment was dealt. Charpy standard specimens were taken from the lowest, middle and highest regions of the weld block. Pre-crack was made using the repeated load. Four point bend and AE tests were conducted simultaneously. Regardless of the specimens, AE signals were absent within elastic region and produced in the process of plastic deformation. AE signals for all specimens were not emitted after the maximum load. Value of signal strength for the all PWHT specimens was lower than that of the weldment. Besides, relations of plastic deformation zone size and accumulated AE counts for the PWHT specimens were more simple compared with the weldment. In case of the PWHT specimen, particles on the fractured surface decreased prominently compared with the weldment due.to PWHT. From these results, it can be concluded that PWHT was effective in reducing the AE sources for the weldment.
Keywords
Multi-Pass Weld; Post Weld Heat Treatment(PWHT); Acoustic Emission(AE); Crack Tip; Plastic Deformation Zone Size; AE Signal Strength;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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