Diffusion Weld Quality Classification Using Ultrasonic C-Scanning
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Solution Overview
Problem
Current non-destructive testing methods for diffusion welding lack accuracy and reliability in quantitatively evaluating the quality of diffusion welding, particularly in determining internal defects and distinguishing between qualified and unqualified products due to large scanning reference sensitivity ranges and unreasonable defect judgment standards.
Innovation Solution
A method involving ultrasonic C-scanning and mechanical performance testing to establish a precise relationship between ultrasonic echo amplitude and tensile strength, allowing for the classification and quality level determination of diffusion welded joints based on the proportion of ultrasonic echo amplitude intervals, ensuring accurate and quantitative evaluation of welding quality without affecting the performance of the diffusion welded product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If commonly used non-destructive testing methods (magnetic particle, eddy current, liquid penetrant) are used to detect diffusion welding quality, then surface and near-surface defects can be detected, but internal defects of the welded surface cannot be detected and results are easily disturbed by material factors
Solution Approach 1:
The patent changes the detection parameter from surface-based methods (magnetic particles, eddy currents, liquid penetrants) to ultrasonic wave parameters that can penetrate and detect internal defects. By using ultrasonic frequency and wave propagation characteristics, the method achieves detection of internal welded surface defects that other methods cannot access.
2Measurement precision
If radiography testing is used to detect volumetric defects, then internal defects can be detected, but the detection is relatively expensive and slow
Solution Approach 1:
The patent replaces the complex and expensive radiography testing system with an ultrasonic testing system. Ultrasonic waves provide similar internal defect detection capability but with faster scanning speeds, lower equipment costs, and no radiation safety requirements, thereby improving productivity while maintaining measurement precision.
3Productivity
If ultrasonic testing is used to detect area-type and line-type defects, then detection sensitivity is high and speed is fast, but the scanning reference sensitivity range is large making accurate quality determination difficult
Solution Approach 1:
The patent segments the continuous ultrasonic echo amplitude range into discrete intervals (first interval, second interval, third interval) with clear boundaries. Each interval corresponds to a specific quality level (first quality level, second quality level, third quality level). This segmentation transforms the ambiguous large-range sensitivity into precise, actionable quality categories, enabling accurate quality determination while maintaining high detection speed and sensitivity.
Solution Approach 2:
The patent changes the evaluation parameter from a continuous amplitude value to a discrete quality level based on amplitude intervals. By establishing correspondence between specific amplitude ranges and quality levels, the method provides objective criteria for quality assessment, eliminating subjectivity and improving measurement precision without sacrificing the speed and sensitivity of ultrasonic testing.
4Measurement precision
If destructive tensile method and metallographic structure detection method are used, then welding quality can be intuitively determined through tensile strength values and metallographic structure, but the inspected object is damaged and cannot be used for further application
Solution Approach 1:
The patent replaces destructive mechanical testing (tensile testing) and metallographic structure detection with non-destructive ultrasonic testing. The ultrasonic echo amplitude provides quantitative information about welded surface quality without damaging the product, maintaining both measurement precision and product integrity for further application.
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 a more accurate and cost-effective means to determine the quality of diffusion welding by accurately dividing the ultrasonic echo amplitude intervals and correlating them with tensile strength, enabling the precise classification of welding quality levels and screening out non-qualified products.
Implementation Method 1
determining to perform ultrasonic C scanning on diffusion welded workpieces by using an ultrasonic testing
Implementation Method 2
obtain ultrasonic echo amplitude data and mechanical performance data of positions of welded joints
Data Source
AI summary
A method for determining the quality of diffusion welding by means of non-destructive testing comprises the steps of determining a testing method, performing batch testing, establishing a relationship, performing a classification of the mechanical performance data of welded joints, performing a classification of quality levels of different welded interfaces, performing a classification of quality levels of the welded joints, and determining quality levels of the welded joints of to-be-tested workpieces.