Ultrasonic Welding Feedback Control for Consistent Polymeric Joint Strength
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Solution Overview
Problem
Ultrasonic welding of polymeric composites often results in inconsistent weld quality due to part and material variations, and existing systems lack real-time quality monitoring and measurement capabilities, especially for single-sided processes.
Innovation Solution
Implementing a method that uses multiple selective pulses with feedback control to monitor and adjust welding parameters such as power dissipation and horn displacement, comparing weld strength values to thresholds to ensure acceptable quality, and adjusting parameters like welding time, energy, and pressure for improved weld quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ultrasonic welding is used without monitoring, then the welding process is simple and fast, but weld quality is inconsistent and cannot be determined online
Solution Approach 1:
The patent implements real-time monitoring of welding parameters (energy, power, horn position) during ultrasonic welding and uses this feedback to determine online weld quality. The system continuously measures these parameters and compares them against thresholds to assess weld quality without removing workpieces from the welding system, thereby improving reliability while managing complexity through automated feedback loops.
2Device complexity
If single-sided ultrasonic welding is used, then the welding process is simpler, but it is difficult to create quality welds due to gap between workpieces
Solution Approach 1:
The patent employs multiple selective pulses with varying parameters (energy, time, pressure) adapted dynamically based on real-time monitoring of welding conditions. The system adjusts pulse characteristics according to measured parameters such as horn displacement and power dissipation, allowing it to compensate for gaps between workpieces in single-sided welding while maintaining manufacturing precision through adaptive control.
3Reliability
If multiple selective pulses with monitoring are implemented, then weld quality improves and online determination is possible, but the welding process becomes more complex
Solution Approach 1:
The system performs self-assessment of weld quality by automatically monitoring its own welding parameters (energy, power, horn position) and comparing them against predetermined thresholds. This self-service capability allows the system to determine online whether weld quality is acceptable without external inspection equipment, improving reliability while keeping the added complexity manageable through automated self-diagnosis.
4Loss of information
If real-time measurement of welding parameters is implemented, then online weld quality assessment becomes possible, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses a multi-functional monitoring system that simultaneously measures multiple welding parameters (energy, power, horn position) using integrated sensors and control electronics. This universal measurement approach captures comprehensive weld quality information through a single integrated system rather than requiring separate measurement devices for each parameter, reducing the overall difficulty of detection and measurement while ensuring no weld quality information is lost.
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 approach enhances weld quality by consistently meeting threshold strength values, reducing scatter in weld strength and area, and improving the robustness of the welding process, particularly for single-sided ultrasonic welding.
Implementation Method 1
high-frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a fusion weld
Implementation Method 2
high-frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a fusion weld
Implementation Method 3
high-frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a fusion weld
Data Source
AI summary
Systems and methods to improve weld quality are described. For example, certain systems and methods described use weld quality monitoring as feedback to an ultrasonic welding process to improve weld quality. Still other systems and methods provide improvement to double sided and single sided ultrasonic welding through the use of selected multiple pulses.