Laser Machining Evaluation via Moving Light Measurement Region
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Solution Overview
Problem
Conventional laser welding quality evaluation methods fail to accurately detect melting abnormalities, such as whisker-like melting objects or spatter adhesion, outside the melting portion due to a fixed monitoring region that only measures light intensity at the melting portion.
Innovation Solution
The evaluation method involves moving a measurement region relative to the object in a way that its path intersects with the laser irradiation path, allowing for the measurement of light intensity changes across a broader area, including regions outside the melting portion, using a photometer and processing device to evaluate the machining quality based on these intensity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed monitoring region is used to measure light intensity at the melting portion, then the measurement system is simple and easy to operate, but the detection accuracy is insufficient for abnormalities outside the melting portion
Solution Approach 1:
The measurement region is made movable relative to the object through reciprocating motion, allowing the photometer to scan multiple areas including the melting portion and surrounding regions. This dynamic measurement approach enables comprehensive detection of abnormalities without requiring multiple fixed sensors, thus improving detection accuracy while controlling system complexity
Solution Approach 2:
The measurement process is divided into multiple measurement regions that are sequentially scanned. The measurement region moves to different positions to measure light intensity at the melting portion and surrounding areas separately, then integrates these measurements for comprehensive evaluation. This segmentation allows thorough inspection without overwhelming system complexity
2Reliability
If the measurement region is moved to cover broader areas including regions outside the melting portion, then the detection capability is improved, but the measurement time and system complexity increase
Solution Approach 1:
The measurement region performs reciprocating motion, moving back and forth between the melting portion and surrounding areas in a periodic manner. This periodic scanning allows the system to efficiently cover multiple measurement regions and return to the melting portion for continuous monitoring, improving evaluation reliability while managing measurement time through structured periodic cycles
Solution Approach 2:
The measurement system continuously scans different regions during the laser machining process without interrupting the machining operation. The photometer maintains continuous light intensity measurements across all measurement regions, ensuring reliable detection of abnormalities while minimizing measurement time through uninterrupted continuous monitoring
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 improves the accuracy of laser machining evaluation by enabling the detection of abnormalities not only at the melting portion but also around it, enhancing the overall assessment of laser machining quality.
Implementation Method 1
light generated in an object due to irradiation of a laser beam to the object is used to evaluate laser machining
Implementation Method 2
a photometer for measuring the intensity of light by moving the measurement region of the photometer relative to the object
Data Source
AI summary
An evaluation method for evaluating laser machining in which irradiation region of a laser beam is moved relative to object to perform machining of object, includes a measurement step and an evaluation step. In the measurement step, a change in an intensity of light according to a movement of measurement region is measured by moving measurement region for measuring the intensity of light, relative to object. In the evaluation step, an evaluation of the laser machining is performed based on the change in the intensity of light according to the movement of measurement region. In the measurement step, measurement region is moved relative to object so that movement path of measurement region has a plurality of intersections with movement path of irradiation region.