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A Study on the Acoustic Emission Characteristics of Weld Heat Affected Zone in SWS 490A Steel(2)  

Rhee, Zhang-Kyu (인천대학교 기계공학과)
Woo, Chang-Ki (인천대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.15, no.5, 2006 , pp. 104-113 More about this Journal
Abstract
The main objective of this study is to investigate the effect of compounded welding by using acoustic emission (AE) signals and doing a source location for weld heat affected zone (HAZ) through tensile testing. This study was carried out an SWS 490A high strength steel for electric shield metal arc welding, SMAW; $CO_2$ gas metal arc welding, GMAW($CO_2$); and gas tungsten arc welding, GTAW/TIG. Data displays are based on the measured parameters of the AE signals, along with environmental variables such as time and load. For instance, Gutenberg-Richter magnitude-frequency relationship (G-R MFR) offers useful b-value in data analysis. Namely event identification, source location gives the X- and Y-coordinates of the AE source. And K-means clustering analysis by Euclidean distance confirmed that was powerful to source location. Generally, strength of welded metal zone was stronger than strength of base metal. As the result, confirmed certainly that fracture is produced in HAZ instead of welded metal zone from source location.
Keywords
Heat Affected Zone; Compounded Welding; Acoustic Emission; Gutenberg-Richter Magnitude-Frequency Relationship; b-value; Source Location; K-means Clustering Analysis; Euclidean Distance;
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Times Cited By KSCI : 1  (Citation Analysis)
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