Defect inspection and defect size measurement in a brazing-typed heat exchanger

Brazing joint is one of the most critical fact in the performance of heat-exchanger. Therefore, The proper method is required for the precise inspection to detect existing defects in the brazing joints. Two types of heat exchangers were analyzed to obtain cross-sectional images by using CT(Computerized tomography) and the defects were inspected with inspection system. The detected defects were saved with their own coordinates and analyzed. With these data, the defects were three-dimensionally imaged reflecting inspection results. As a result, the type and shape of defects existing in the samples were confirmed.