Inspection of brazing joint defects in the heat exchanger using X-ray

X-ray cross-sectional images were used to inspect the brazing joints of heat exchanger rather than penetration images. This paper focused on developing non-destructive testing using X-ray to inspect defects of brazing heat exchanger. The cross-sectional images of brazing joints are obtained by using CT (computerized tomography). Since the penetration images are three-dimensionally superimposed, the cross-sectional images are necessary to have a correct inspection of brazing joints. The performance of testing is an important factor in the image processing. Thus, the image threshold and canny edge detection are used for faster and correct imaging process. Defect inspection of brazing joints is conducted. Brazing joint defect inspection process was programmed by Visual C++ which offers a various image processing methods. The result of this study may help increase interests of non-destructive testing and contribute to the relative industries with improved quality and reliability of heat exchanger.