Spot Weld Nugget Diameter Estimation Under Varying Welding Conditions
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Solution Overview
Problem
The correlative relationship between electrode displacement and nugget diameter in resistance spot welding changes with welding conditions, leading to inaccurate nugget diameter estimation in conventional methods.
Innovation Solution
A nugget diameter estimation method involving a reference welding process to measure expansion amounts and diameters of test materials, determining a relational formula between these parameters, and applying this formula to estimate nugget diameters in main welding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional displacement measurement methods are used, then the measurement process is simple, but the nugget diameter estimation accuracy deteriorates due to changing correlative relationships under varying welding conditions
Solution Approach 1:
The patent performs preliminary welding experiments under various welding conditions to establish correlative relationships between displacement and nugget diameter before actual welding. This preliminary action creates a database of relationships that can be selected during welding, resolving the contradiction by preparing accuracy-enhancing data structures in advance without adding complexity to the welding process itself
Solution Approach 2:
The patent dynamically selects the appropriate correlative relationship based on detected welding conditions. Instead of using a fixed relationship, the system adapts the displacement-to-nugget-diameter conversion formula according to the actual welding parameters, maintaining high estimation accuracy across varying conditions without requiring complex real-time measurement systems
2Productivity
If welding conditions are varied to improve productivity, then the welding process becomes more flexible, but the correlative relationship between displacement and nugget diameter changes, worsening estimation accuracy
Solution Approach 1:
The patent explicitly accounts for parameter changes by establishing separate correlative relationships for different welding conditions (current, pressure, time). The system detects which parameters are being used and selects the corresponding relationship, allowing flexible welding parameter adjustment while maintaining accurate nugget diameter estimation through conditional formula selection
Solution Approach 2:
The patent incorporates feedback by detecting actual welding conditions and using this information to select the appropriate correlative relationship. This feedback loop ensures that the estimation system adapts to varying welding parameters, maintaining accuracy even when productivity is improved through parameter optimization
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 improves the accuracy of nugget diameter estimation by establishing a strong correlation between expansion amounts and nugget diameters, even under varying welding conditions.
Implementation Method 1
a main welding process of measuring an expansion amount of the welded material, and bonding the welded material through energization while pressurizing the welded material with a pair of electrodes
Implementation Method 2
bonding the welded material through energization while pressurizing the welded material with a pair of electrodes
Data Source
AI summary
A nugget diameter estimation method of a welded material bonded by resistance spot welding includes: a reference welding process of bonding a test material while measuring an expansion amount of the test material; a nugget diameter measurement process of measuring a nugget diameter of the bonded test material; a relational formula determination process of determining a relational formula between the measured nugget diameter of the test material and the expansion amount of the test material; a main welding process of measuring an expansion amount of the welded material, and bonding the welded material through energization while pressurizing the welded material with the pair of electrodes; and a nugget diameter estimation process of estimating a nugget diameter of the bonded welded material using the expansion amount of the welded material and the relational formula.