Resistance Spot Welding Spatter Detection by Molten Volume Change
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Solution Overview
Problem
Existing spatter detection methods in resistance spot welding often fail to accurately detect small sputter occurrences due to insufficient changes in electrode displacement, voltage, or resistance, leading to unsatisfactory welding quality.
Innovation Solution
A spatter detection method that measures changes in the volume of the molten part during resistance spot welding, using the distance between electrodes and internal stress to calculate volume changes, allowing for high-accuracy detection of sputter occurrence through a rate of change analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spatter detection methods (electrode displacement, voltage, or resistance changes) are used, then the detection system is simple to implement, but the detection accuracy is insufficient for small sputter occurrences
Solution Approach 1:
The patent replaces conventional electrical detection methods (measuring voltage, resistance, or electrode displacement) with a magnetic field-based detection system. By detecting changes in the magnetic field generated by the molten metal during welding, the system achieves higher measurement precision for spatter detection without relying on subtle electrical signal changes that are difficult to detect accurately.
Solution Approach 2:
The patent monitors changes in magnetic field parameters (field strength, distribution, or characteristics) that occur when spatter is generated during welding. By tracking these magnetic parameter variations over time, the system can detect even small spatter occurrences with high accuracy, overcoming the limitation of conventional methods that rely on minimal electrical parameter changes.
2Measurement precision
If detection sensitivity is increased to detect small sputter, then detection accuracy improves, but false detection or noise interference increases
Solution Approach 1:
The patent employs feedback mechanisms where the detected magnetic field changes are continuously monitored and compared against reference patterns or thresholds. This feedback loop allows the system to distinguish between actual spatter events and normal welding variations, improving reliability by reducing false detections while maintaining high sensitivity for detecting small sputter occurrences.
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 method enables precise detection of sputter occurrences regardless of size, improving the accuracy and quality of resistance spot welding by calculating volume changes using electrode stroke and pressure measurements.
Implementation Method 1
a material to be welded, obtained by stacking a plurality of metal members on one another, is joined by sandwiching the material to be welded between a pair of electrodes and feeding an electric current therethrough
Implementation Method 2
a detection unit that detects a change in a magnetic field generated by the molten part
Data Source
AI summary
A spatter detection method in which the accuracy of detection of an occurrence of sputter is high, and a method for manufacturing a welded member are provided. A spatter detection method according to the present disclosure is a spatter detection method for detecting an occurrence of sputter in resistance spot welding, the resistance spot welding being welding in which a material to be welded, obtained by stacking a plurality of metal members on one another, is joined by sandwiching the material to be welded between a pair of electrodes and feeding an electric current therethrough, in which the occurrence of sputter is detected based on a change in a volume of a molten part of the material to be welded.