Defect sizing in the ultrasonic testing of brazed joints and high-temperature brazed joints

Investigations on ultrasonic testing of brazed joints and high-temperature brazed joints are presented. In addition to discussing the basic connections between the signs and indications of the transition from the base material to the brazing alloy, the accompanying deterioration in defect detection is also covered. The resultant different detection limits depend on the combination of base material and brazing alloy. As well as optimizing the test parameters to ensure as sensitive a detection as possible, investigations are also carried out to provide a more accurate description of the defects and their size, nature and position. The validity of the results under the existing boundary conditions are discussed on the basis of a relatively large number of specimens. It is now possible in practice to plot a generalized AVG diagram for abitrary material combinations, by means of which defect evaluation becomes relatively simple.