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Vol.4 No.3 previous AA-SP7(46-47-48)-NT 50 -51-52

Academic Articles
Regular Paper Vol.4No.4 (2013) p.125 - p.132
 

Trends Identified Between Successful and Unsuccessful Candidates that have Participated in the Japanese Performance Demonstration (PD) Program of Stress Corrosion Cracking (SCC) Depth Sizing

 
Hajime SHOHJI1,*, Koichiro HIDE1 and Keiji WATANABE1
 
1Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka-Shi, Kanagawa 240-0196, Japan
Chalk River, ON, K0J 1J0, Canada
 
Abstract
The 1st Japanese Performance Demonstration (PD) qualification examination started in March of 2006 and was operated by the Performance Demonstration (PD) center of Central Research Institute of Electric Power Industry (CRIEPI). As of December 2012, 36 examination sessions have been completed and 44 out of 48 candidates have passed the examination. The total number of tests administered including re-tests was 87. A reason for failure is “the incorrect choice of the crack tip echo”. Candidates cannot differentiate the weld to base metal interface echoes and crack branch echoes from the actual crack tip echo. It was noted that depth sizing using phased array and conventional angle beam tip diffraction techniques is the most effective way to pass the examination. A statistical analysis shows that the average depth sizing error is 0.33mm with a standard deviation of 1.92mm for the successful applicant. The primary reason for failure is the overestimation of the crack depth.
 
Keywords
Performance Demonstration, Ultrasonic Testing, IGSCC, Phased Array, Qualification, Depth Sizing, Specimen, Tip Echo, Statistical Analysis
 
Full Paper: PDF EJAM Vol.4No. 4 pp.125-132 "Trends Identified Between Successful and Unsuccessful Candidates that have Participated in the Japanese Performance Demonstration (PD) Program of Stress Corrosion Cracking (SCC) Depth Sizing"
Article Information
Article history:
Received 16 January 2013
Accepted 18 Feburary 2013