Investigation of Acoustic Emission Characteristics on Harbor Portal Crane

Acoustic emission (AE) testing was carried out for the inspection of A-frame structure in a harbor portal crane and its testing areas were the repair welding on the A-frame. The acoustic emission localization characteristics, parameter distribution, and frequency spectrum characteristic are analyzed in this chapter. Also, the magnetic particle testing was used for reinspection of the AE location areas. The results indicated that the AE linear location method could be used well on the A-frame of the harbor portal crane during the loading test, which AE sources was produced by the surface crack defects of the repair welding. During the loading process, the maximum AE signal amplitude of the located events is about 69 dB, and the AE signal frequency mainly in 100-250 kHz range. During the load-keeping process, the maximum AE signal amplitude of the located events is about 55 dB, and the AE signal frequency mainly in 100-400 kHz range with a peak at about 160 kHz.