Ultrasonic Joint Inspection via Waveform Amplitude Comparison
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Solution Overview
Problem
Current non-destructive inspection methods for assessing the quality of plastic pipe butt fusion joints are either expensive, complex, or unreliable due to operator skill dependence, and lack a simple, user-friendly solution for detecting defects without prior joint processing.
Innovation Solution
A method utilizing ultrasonic inspection by transmitting acoustic waveforms at specific angles and comparing waveform amplitudes against calibration standards to automatically assess the quality of joined material interfaces, including butt fusion and electrofusion joints, without requiring user input or joint pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual ultrasonic inspection methods are used, then joint quality can be assessed, but the results are heavily dependent on operator skill making them unreliable and inconsistent
Solution Approach 1:
The inspection system performs self-evaluation by automatically comparing detected waveform characteristics against pre-stored reference waveforms from known good and bad joints. The computer system independently determines joint quality without human intervention, eliminating operator skill dependence and ensuring consistent, reliable results across different inspections.
Solution Approach 2:
The patent replaces manual mechanical ultrasonic inspection with an automated computer-based system that uses digital signal processing. The computer automatically analyzes waveform data, compares it against reference standards, and determines joint quality, substituting human operator judgment with automated computational analysis for more consistent and reliable results.
2Reliability
If expert operators use commercial ultrasonic equipment, then suspect joints can be identified, but the discrimination criteria vary significantly from operator to operator and it is too expensive
Solution Approach 1:
The system performs self-diagnosis by automatically comparing inspection waveforms against pre-stored reference waveforms from known good and defective joints. The computer independently evaluates joint quality without requiring expert operators, making the system both more reliable and easier to use while reducing costs by eliminating the need for highly trained personnel.
Solution Approach 2:
The patent creates digital copies of waveform characteristics from known good and bad joints and stores them in the computer for comparison. These reference waveform copies serve as standards against which all inspections are automatically evaluated, providing consistent discrimination criteria that eliminate operator variability and reduce the need for expensive expert operators.
3Ease of operation
If visual inspection methods are used, then the process is simple, but joint failures occur because visual inspection is insufficient for detecting internal defects
Solution Approach 1:
The patent replaces simple visual inspection with automated acoustic wave-based inspection using computers. The system transmits acoustic waves through the joint, detects reflected waves, and automatically analyzes the signals to identify internal defects that visual inspection cannot detect, maintaining simplicity while dramatically improving reliability.
Solution Approach 2:
The inspection system performs automatic self-evaluation by comparing detected acoustic wave patterns against pre-stored reference patterns from known good and defective joints. The computer independently determines joint quality without human intervention, providing reliable defect detection while keeping the operation simple and automated.
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
Enables accurate and efficient discrimination between acceptable and defective joints, reducing operator expertise needs and costs, while being adaptable to various pipe diameters and materials, with high accuracy in identifying specific flaws.
Implementation Method 1
transmitting a plurality of acoustic waveforms onto a joined material interface at an angle greater than 0° and less than 90° with respect to an orientation or interface plane of the joined material interface; detecting a reflected waveform reflected from the joined material interface for each of the acoustic waveforms
Data Source
AI summary
A method for inspecting joined material interfaces, such as butt fusion pipe joints of plastic pipes, using ultrasonic waveforms to discriminate between acceptable and unacceptable interfaces. The waveforms (amplitude vs time) having been transmitted to a material interface of interest are divided into a number of time zones and the amplitudes of the waveforms within the time zones compared against waveform amplitudes obtained from known acceptable joined material interfaces to determine the quality of the material interface of interest.