Axial symmetry workpiece ellipse-like defect reconstruction method

Abstract

The invention relates to an axial symmetry workpiece ellipse-like defect reconstruction method. The method includes: adopting an axial symmetry workpiece ultrasonic detection system to collect signals of an actual workpiece; utilizing an amplitude threshold method to recognize defect reflection echo, and extracting time features; calculating a distance from the surface of a defect to the surface of the workpiece; according to a principle that the boundary of the defect is tangential with wavefront arcs, adopting a circle to approximate an elliptic arc section, and fitting an elliptic model tangential with all wavefront arcs. The method avoids errors of conventional methods based on transmission time delay in the aspect of the principle, is more convenient to operate than reverse time inversion methods and is suitable for ellipse-like defects of bubbling and mingling.

Description

technical field

[0001] The invention belongs to the technical field of defect detection methods for axisymmetric workpieces, and in particular relates to a method for reconstructing ellipse-like defects in axisymmetric workpieces. This method is suitable for elliptical defects such as air bubbles and inclusions. Background technique

[0002] Axisymmetric structure is the main structure of material processing and product production. Axisymmetric workpieces are widely used in national defense, aerospace, transportation and other fields. They are generally produced by metal or alloy materials through warm extrusion or casting processes. During the production process Defects such as tiny bubbles and inclusions are prone to occur in the medium. During use, due to high strength, high temperature and high pressure, friction, alternating loads, etc., larger cracks and fractures are likely to appear in the bubbles and inclusion areas, which will affect the normal and safe use of the ...

Images