Ultrasonic phased array detecting and monitoring method

Abstract

The invention relates to an ultrasonic phased array detecting and monitoring method, and belongs to the metal welding nondestructive detection field. The method is characterized in that an ultrasonic phased array probe moves at a uniform speed in a direction paralleling to a weld direction, an image and a waveform displaying the echo signal in the weld of a test piece in a phased array ultrasonic instrument display are simultaneously observed while moving the probe, and whether the thin plate weld has a known defect or not can be judged through comparing with a defective etch image and a defective etch signal which are previously stored. The image formed by the ultrasonic echo signal in the thin plate weld can be seen in real time in the detection process, and the image comprises the information comprising the position, the length and the like of the defect, so compared with methods for simply judging the probe quality through the waveform, the ultrasonic phased array detecting and monitoring method has the advantages of accuracy, misjudgment reduction, and improvement of the accuracy and the working efficiency.

Description

technical field [0001] The invention relates to an ultrasonic phased array detection and monitoring method, which belongs to the field of metal welding non-destructive testing. Background technique [0002] The Friction Stir Welding method is a patented welding technology proposed by The Welding Institute in the United Kingdom. This technology has been widely used in the aviation industry at home and abroad, such as in the skin of military or civil aircraft, and in spacecraft. low-temperature fuel tanks, aircraft fuel tanks, auxiliary fuel tanks of military aircraft, military or scientific and technological detection rockets, etc., especially suitable for joining high-strength aluminum alloys that are difficult to weld by conventional welding processes. It has low welding temperature, small deformation of weldments, and excellent mechanical properties of joints. Well, it does not produce casting structure defects similar to welded joints, and the weld structure is refined du...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the present invention: In order to overcome the technical deficiency that the existing technology cannot detect the quality of friction stir welded thin plate joints, the present invention proposes an ultrasonic phased array detection and monitoring method, which can detect the joint quality of friction stir welded thin plates

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