An automated radiographic NDT system for weld inspection: Part II—Flaw detection

An automated radiographic NDT system for weld inspection has been developed. The entire system consists of two major components: weld extraction and flaw detection. Part I of the system implemented a weld extraction methodology, which has been presented in a previous paper. This paper presents Part II of the system dealing with the detection of welding flaws. The flaw detection methodology is developed based on the fitted line profiles of a weld image and consists of four modules: preprocessing, curve fitting, profile-anomaly detection, and postprocessing. The successful detection rate and false alarm rate of the methodology are reported based on the test results of 24 representative welds.