Laser Welding Assessment via Contour Position Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser welding assessment methods using reflected light or plasma monitoring often misjudge welding defects, leading to inaccurate quality assessment.
Innovation Solution
A method that measures the position of cylindrical metal members during laser welding, judges position deviations, and adjusts accordingly to ensure accurate laser irradiation, using a combination of contour measurements, camera imaging, and controller-controlled laser devices to assess and correct position deviations before and during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reflected light or plasma light monitoring is used during laser welding, then welding defects can be detected, but misjudgment of welding defects occurs leading to inaccurate quality assessment
Solution Approach 1:
The patent extracts the measurement task from the welding zone to the contour of the workpiece. Instead of monitoring light in the welding zone (which causes misjudgment), the system measures the contour position of the workpiece before and during welding to detect position deviations, thereby avoiding the harmful interference in the welding zone while still enabling accurate quality assessment
Solution Approach 2:
The patent introduces the workpiece contour as an intermediary measurement target. Rather than directly monitoring the welding process (which causes misjudgment), the system uses the contour position as a mediator to infer welding quality. The contour measurement serves as an indirect but accurate indicator of welding position deviation
2Measurement precision
If contour measurement is performed during laser welding, then position deviation can be accurately detected, but measurement accuracy is affected by laser light and plasma
Solution Approach 1:
The patent performs preliminary contour measurement before laser welding starts. This preliminary action captures the initial contour position without laser light interference. The system then compares this pre-welding contour data with during-welding contour data to detect position deviations, thereby avoiding the harmful effects of laser light and plasma on the measurement
Solution Approach 2:
The patent cushions against laser light and plasma interference by establishing a baseline contour measurement before welding begins. This beforehand cushioning creates a reference state that protects the measurement system from the harmful effects of laser light and plasma during the welding process
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 allows for precise judgment of welding position deviations, preventing defects and ensuring high-quality laser welding by accurately determining when the laser is applied at the correct position, thereby enhancing the reliability of the welding process.
Implementation Method 1
conventional judgment method, reflected light of laser light or plasma light emitted from the welded part is monitored
Data Source
AI summary
Disclosed is an assessment method for making an assessment of laser welding between first and second cylindrical metal members, wherein the first and second cylindrical metal members are arranged coaxially to define an overlap range where the first and second cylindrical metal members overlap each other; and wherein the laser welding is performed on the overlap range along a circumferential direction of the overlap range. The assessment method includes: during the laser welding, carrying out a measurement of a position of a contour of at least one of the first and second cylindrical metal members; and judging the occurrence or non-occurrence of a position deviation of the at least one of the first and second cylindrical metal members based on a result of the measurement.