A Method for Precisely Locating Defects on Materials in Ultrasonic Testing

Abstract

The invention relates to a method for accurately positioning the defects of a material during ultrasonic detection. The method comprises the following steps: firstly, establishing a reference position on a water-immersion based ultrasonic C scanning detection system, and calibrating the coordinate of the reference position in an ultrasonic probe acoustic-beam scanning position coordinate system; then putting the material to be detected in the reference position of the detection system through a positioning reference plane processed on the material to be detected, and carrying out ultrasonic C scanning detection, determining the accurate coordinates of all the defects in the ultrasonic probe acoustic-beam scanning position coordinate system on an ultrasonic C scanned image by using the defect searching function of the water-immersion based ultrasonic C scanning detection system, and deducting the coordinates of the detects on the ultrasonic C scanned image from the coordinate of the reference position on the water-immersion based ultrasonic C scanning detection system to obtain the accurate coordinates of the defects on the positioning reference plane processed on the material to be detected; and finally combining the coordinates of the defects on the positioning reference plane processed on the material to be detected with the depths of the defects read by an ultrasonic defect detection unit on the ultrasonic detection surface of the material to be detected to form the three-dimensional spacial position coordinates of the defects in the material to be detected.

Description

technical field [0001] The invention relates to a method for accurately locating defects on materials in ultrasonic testing, belonging to the technical field of non-destructive testing. Background technique [0002] Nondestructive testing has been widely used in defect detection and quality evaluation of metal products. It is very important to obtain the precise position information of small defects in the material in the non-destructive testing of metal products. It is an important basis for guiding the metallographic anatomy of materials and verifying the effectiveness of the testing process. It is an important basis for the material manufacturing department to analyze the nature of defects and guide the improvement of product manufacturing processes. For reference, it is also in hot research fields such as structural life prediction and material non-destructive evaluation. Effectively carry out sampling and mechanical performance testing of material defects important pre...

AI Technical Summary

Problems solved by technology

The above method avoids the defect positioning error caused by manually marking the position of the probe and the deviation of the sound beam from the theoretical position in the contact method detection, and since the time and speed of the sound wave between the defect and the detection surface can generally be accurately measured, it should be possible to obtain High defect positioning accuracy, but this method needs to detect and locate the same defect from three different detection surfaces of the defective sample, which is not suitable for batch operation and low efficiency. When there are multiple dense adjacent defects in the sample at the same time , it will be difficult to accurately distinguish the same defect from different detection surfaces, and it is easy to make mistakes

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