Thermoplastic Weld Evaluation With Internal Temperature Sensing

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Solution Overview

Problem

Existing methods for evaluating the welding of thermoplastic materials lack effective means to assess performance, efficiency, speed, integrity, and uniformity of weld joints, particularly in large-scale industrial applications, and there is a need for a method to calibrate and monitor the welding process.

Innovation Solution

A method involving a test piece with perforated parts, a heating element, and temperature sensors that move relative to the parts during welding, allowing internal and surface temperature measurement and comparison with reference temperatures to calibrate and evaluate the welding process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If welding parameters are optimized to improve weld joint quality, then welding integrity and homogeneity are improved, but the complexity of controlling heating parameters increases

Engineering Contradiction:

Improveweld joint qualityVSAvoidheating control complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements feedback control by measuring the actual temperature of the insert and comparing it to the desired temperature profile, then adjusting heating parameters accordingly. This closed-loop system maintains weld joint quality while managing heating control complexity through automated regulation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces complex mechanical heating control systems with electromagnetic induction heating, which offers more precise and easier-to-control temperature regulation. The induction heating system allows for rapid heating and better temperature uniformity without the mechanical complexity of traditional heating methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If temperature measurement is performed at multiple points to improve thermal profile assessment, then measurement precision is improved, but the complexity of the measurement system increases

Engineering Contradiction:

Improvethermal profile measurement precisionVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent employs a multi-functional measurement system that can measure temperature at multiple points simultaneously using a coordinated array of sensors. This single integrated system performs multiple measurement functions, improving thermal profile assessment precision without proportionally increasing system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses multiple temperature sensors to create a comprehensive thermal map of the welding zone. By distributing sensors across key measurement points and integrating their readings, the system achieves precise thermal profile assessment through a coordinated network rather than a single complex sensor.

Inventive Principle:

Principle #26Copying

3Productivity

If welding speed is increased to improve productivity, then output per time is improved, but weld joint integrity and homogeneity deteriorate

Engineering Contradiction:

Improvewelding speedVSAvoidweld joint homogeneity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic heating control where heating power and speed are adjusted in real-time based on the welding process stage and material response. This dynamic adaptation allows high welding speeds while maintaining temperature uniformity and joint homogeneity through continuous optimization of heating parameters.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes heating parameters (power, duration, distribution) dynamically during the welding process to match the required welding speed. By adjusting these parameters in response to process conditions, the system achieves both high productivity and consistent weld joint quality.

Inventive Principle:

Principle #35Parameter changes

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 precise evaluation of welding quality, ensuring optimal welding parameters and consistent joint integrity, particularly suitable for the aeronautics sector where strict safety standards apply.