2012 Volume 53 Issue 2 Pages 311-315
“GUCHI” (Geometric Unravel for Crack Height Image) technique is one of the stereo-radiography methods for flaw sizing in radiographic testing. The AN (Application of Nondestructive Testing techniques for industrial fields) committee in the JWES (The Japan Welding Engineering Society) carried out the experiment on this technique. The results were reported at FENDT 2002 and APCNDT 2003 and 2006 with data on the steel plates and pipes including fatigue cracks and EDM slits. The flaw sizing by RT-GUCHI was performed in a round robin test on 6 inches stainless steel pipe which had circumferential semi-elliptical fatigue cracks with 0.2t, 0.4t and 0.6t height at the OD surface and on plate including a fatigue crack. A trial for flaw sizing of SCC was also performed.
This paper describes the fundamental of GUCHI technique, the discussion results of the accuracy for flaw sizing which was investigated before 2006 and the results of the round robin tests on test specimens with fatigue cracks.
