Abstract
This chapter presents both theoretical approach to as well as experimental results from the application of nondestructive testing (NDT) data fusion to weld inspection. Nondestructive examination of welds on plates, pipes, and T-joints with induced defects performed using two commercial eddy current systems is described in the chapter. The chapter also presents the fusion of eddy current, radiographic, and ultrasonic data from a surface breaking defect. A parallel multisensor approach using Dempster-Shafer evidential reasoning and Bayesian statistical theory was utilized for combining defect information such as length and depth from up to five NDT sensors. The chapter also introduces NDT data fusion at pixel level. The performances of the three data fusion processes applied to NDT are discussed in the chapter. The operations described in the chapter have shown that no two NDT systems provide identical information regarding a defect size or location. However, the combination of information from multiple systems helped in decision making and increased accuracy.
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