Aiming at the defect recognition of film welds in nondestructive testing of pressure vessels, a method for identifying film weld defects is proposed based on the characteristics of defect images, using image preprocessing, image segmentation algorithm, expert system and other methods, and implemented under MATLAB. The basic principles, structure, establishment method and recognition strategy of the expert system are introduced, and identification is performed at different levels according to the characteristics of weld defects. Through continuous experiments, the film defect expert system library is improved to further improve the defect recognition rate.
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