Shear Wave Oblique Probe for Accurate Weld Defect Characterization
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Solution Overview
Problem
Current ultrasonic flaw detection methods, such as A-mode pulse technology, struggle to accurately detect and characterize defects in welds due to limitations in reflecting the true shape and size of defects, often leading to incorrect measurements and misinterpretation of defect types and orientations.
Innovation Solution
A reflection-diffraction-deformation flaw detection method using a transverse wave oblique probe that combines reflected, diffracted, and deformed waves to precisely position, quantify, and characterize defects, enabling three-dimensional rendering of defect shapes by analyzing the paths and characteristics of these waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If A-mode pulse ultrasonic technology uses reflected waves from defects for detection, then the detection method is simple and easy to operate, but the measurement precision of defect shape, size, and orientation is insufficient
Solution Approach 1:
The patent segments the ultrasonic detection process into three distinct wave analysis components: reflected wave analysis for defect presence detection, diffracted wave analysis for defect endpoint localization, and deformed wave analysis for defect shape characterization. This segmentation allows each wave type to contribute specific information, collectively achieving precise three-dimensional defect characterization while maintaining operational simplicity through integrated automated analysis.
2Device complexity
If the equivalent method compares defect reflected wave height with standard reference objects, then the detection process is simplified, but the accuracy of defect characterization and quantification deteriorates
Solution Approach 1:
The patent introduces diffracted waves and deformed waves as intermediary analysis components that bridge the gap between simple reflected wave detection and precise defect characterization. The diffracted waves serve as mediators for endpoint localization, while deformed waves mediate shape analysis, allowing the system to transcend the limitations of equivalent method comparisons and achieve accurate three-dimensional defect reconstruction without complex additional equipment.
3Ease of operation
If only reflected waves are used for defect detection, then the detection method is straightforward, but the ability to accurately determine defect shape, size, and orientation is lost
Solution Approach 1:
The patent merges three previously separate ultrasonic wave analysis methods (reflected wave, diffracted wave, and deformed wave detection) into a unified integrated system. By combining these wave types and their respective information contributions, the system recovers complete defect characterization data including shape, size, and orientation that would be lost using reflected wave detection alone, while maintaining operational simplicity through automated multi-wave analysis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides accurate and precise detection of defects, overcoming the limitations of previous technologies by using the combination of wave types to determine defect orientation, size, and shape, leading to improved characterization and measurement of weld flaws.
Implementation Method 1
When an ultrasonic transverse wave meets a defect in a weld of a plate to be inspected during propagation, it will generate a reflected wave, a diffracted wave, and a deformed wave
Implementation Method 2
When an ultrasonic transverse wave meets a defect in a weld of a plate to be inspected during propagation, it will generate a reflected wave, a diffracted wave, and a deformed wave
Implementation Method 3
The shape and size of the defect are determined by the deformed wave having deformation characteristics, namely the deformed surface wave generated at the endpoints of the defect which propagates on the defect surface
Data Source
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Figure 13-1~15-2
AI summary
The invention provides a shear wave oblique probe reflected/diffracted/deformed wave detection method. When an ultrasonic shear wave is propagated and encounters a flaw, reflected, diffracted, and deformed waves are generated; comprehensive analysis is performed on these waves, and it is determined, according to reflection features of the reflected waves and diffraction features of the diffracted waves, whether a flaw exists; the shape and size of the flaw is obtained according to a deformed surface wave generated at a flaw end point; by combining propagation paths of the deformed surface wave, the deformed shear wave, the deformed longitudinal wave and the transmitted shear wave generated by the flaw, the causes of all the waves displayed on a screen are revealed, so as to determine a basis for determining an angle or direction of a flaw, thereby accurately positioning flaws, performing quantitative and qualitative analysis, and displaying in three dimensions the actual flaw shape by using A-scan ultrasonic techniques.