Metal Joint Integrity Testing via Resistance Change Under Stress
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Solution Overview
Problem
Existing non-destructive testing techniques for welds either fail to access the interior of the weld, require expensive equipment, or necessitate multiple mechanical contacts, making them inefficient for high-throughput manufacturing of inexpensive items like batteries.
Innovation Solution
A method and system that apply stress to a metal joint, measure its resistance using four-terminal sensing, and determine structural integrity by comparing the stressed resistance to a baseline, allowing for automation and cost reduction without the need for direct contact or expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiographic inspection is used to reveal the interior of the weld, then measurement precision is improved, but device complexity and cost increase due to expensive equipment and radiological shielding
Solution Approach 1:
The patent replaces complex mechanical/radiographic inspection systems with an electrical measurement system. By applying stress to the metal joint and measuring resistance changes through electrical contacts, the system achieves weld interior detection without requiring radiographic equipment or shielding, thus reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent changes the measurement parameter from direct structural inspection to electrical resistance measurement under stress. By monitoring resistance changes when stress is applied, the system indirectly detects weld interior conditions, achieving accurate detection with simpler equipment
2Measurement precision
If ultrasonic inspection or eddy current inspection is used to inspect welds, then measurement precision is improved, but ease of operation deteriorates due to requiring direct contact and substantial mechanical automation
Solution Approach 1:
The patent replaces contact-based ultrasonic and eddy current inspection methods with an electrical resistance measurement system. By using electrical contacts to measure resistance changes under stress, the system achieves weld inspection accuracy without requiring complex mechanical positioning or direct probe contact, significantly improving ease of operation
Solution Approach 2:
The patent creates a multi-functional testing system that can inspect multiple welds simultaneously through electrical circuit measurements. The same electrical contacts used for resistance measurement also serve as stress application points, eliminating the need for separate inspection mechanisms and reducing automation complexity
3Ease of operation
If liquid penetrant inspection or magnetic particle inspection is used, then ease of operation is improved, but productivity deteriorates due to requiring application of working medium or particles which is too cumbersome for high-throughput manufacturing
Solution Approach 1:
The patent replaces liquid penetrant and magnetic particle inspection methods with electrical resistance measurement. By eliminating the need to apply and remove working mediums or particles, the system achieves inspection simplicity while enabling high-throughput manufacturing through rapid electrical measurements that can be performed inline during production
Solution Approach 2:
The patent enables continuous inspection by integrating resistance measurement into the manufacturing process flow. Electrical resistance can be measured continuously without interrupting production, unlike liquid penetrant or magnetic particle methods that require application, dwell time, and removal steps, thus maintaining both operational simplicity and high productivity
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 efficient and cost-effective testing of metal joints by focusing on resistance changes under stress, increasing throughput and reproducibility while directly assessing electrical properties relevant to weld quality.
Implementation Method 1
measuring a resistance of a circuit including the metal joint during application of the stress to the metal joint
Data Source
AI summary
A method is for testing the structural integrity of a metal joint such as a weld. The method includes applying stress to the metal joint, and measuring a resistance of a circuit including the metal joint during application of the stress to the metal joint. A structural integrity of the metal joint is determined by comparing the measured resistance with a baseline resistance.