An ultrasonographic method used for weld seam detection

Abstract

An ultrasonographic method used for weld seam detection is provided. Aiming at weld seam ultrasonic phased array detection situations, the method includes collecting echo data of ultrasonic waves emitted separately in order by each array element by utilization of a full array, and performing pixel point-by-point focusing imaging treatment to obtain echo intensity corresponding to each pixel. The method improves imaging quality for weld seam detection and sensitivity for small-size detect detection for weld seams, further ensures performance and reliability of ultrasonic nondestructive testing for weld seams, and avoids accidents caused by unqualified welding quality of the weld seams.

Description

technical field [0001] The invention relates to the technical field of ultrasonic nondestructive testing of welds, in particular to an ultrasonic imaging method for weld testing. Background technique [0002] In recent years, ultrasound has become more and more widely used in the field of non-destructive testing (NDT). For welds, it is generally divided into traditional detection methods based on single-chip transducers and ultrasonic imaging methods based on arrays. The former includes diffraction time difference method and pulse reflection method. [0003] Ultrasonic diffraction time-of-flight method is a method to detect defects by relying on the diffraction energy obtained from the "end angle" and "end point" of the internal structure of the weld, and is used for the detection, quantification and positioning of defects. Diffraction time-of-flight technology is used to quantify the defects in the middle of the weld, and its quantitative accuracy is much higher than that ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned existing technical problems of inaccurate quantification and positioning, low detection speed, or low imaging resolution of defect areas in the above-mentioned existing weld seam ultrasonic detection method. The ultrasonic imaging method for weld seam detection is different from the above-mentioned traditional ultrasonic imaging method. The present invention aims at the particularity of weld seam detection, adopts direct wave and multiple reflected wave joint detection, adopts single-array elements to emit sequentially, and collect data with full aperture. Realize sending and receiving focusing for each imaging point

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