Resistance Welding Control with Adaptive Parameters for Mixed Sheet Joints
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Solution Overview
Problem
Resistance welding processes face challenges in maintaining consistent quality, particularly when welding aluminum and galvanized steel sheet combinations with varying thicknesses, due to high specific conductivity and shunt influences, leading to unstable heat conversion and increased wear on electrodes.
Innovation Solution
A resistance welding device with a welding control system that adjusts controller parameters, such as proportional gain and reset time, specifically for each sheet thickness and material combination, using a database to optimize current and force/torque controllers, allowing for precise adaptation of welding parameters without additional hardware or sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard welding control parameters are used for all sheet combinations, then device complexity is reduced, but welding quality and repeatability deteriorate due to varying material properties
Solution Approach 1:
The patent implements preliminary action by pre-storing multiple sets of controller parameters (proportional gain, reset time) in a database, each optimized for specific sheet thickness and material combinations. Before welding, the system automatically selects the appropriate parameter set based on the workpiece data, eliminating the need for manual adjustment and ensuring optimal welding quality for each material combination without increasing operational complexity
Solution Approach 2:
The patent applies dynamics by making the controller parameters adaptive and variable rather than fixed. The welding control system dynamically adjusts proportional gain and reset time based on the detected sheet combination, allowing the control characteristics to change optimally for each material type. This dynamic adaptation improves welding reliability across varying materials while maintaining automated operation
2Reliability
If welding parameters are optimized for each sheet combination, then welding quality improves, but the time required for parameter selection and adjustment increases
Solution Approach 1:
The system performs preliminary action by pre-configuring and storing optimized controller parameters in a database before production. Each parameter set is pre-matched to specific sheet thickness and material combinations, allowing the control system to automatically retrieve the correct parameters without manual adjustment during welding operations, thus eliminating parameter setup time while maintaining optimal welding quality
Solution Approach 2:
The patent implements feedback by automatically detecting the sheet thickness and material combination at the welding position, then using this information to automatically select and apply the corresponding optimized parameters from the database. This closed-loop feedback mechanism eliminates manual parameter selection time while ensuring the correct parameters are applied for each material combination
3Measurement precision
If additional sensors are added to detect sheet properties, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent applies self-service by utilizing information that is already available in the production system - specifically, the workpiece data that identifies sheet thickness and material combination. Instead of adding sensors to detect these properties, the system uses the existing workpiece identification information to automatically select the appropriate welding parameters, eliminating the need for additional detection hardware while maintaining precise parameter selection
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 significantly improves welding quality and repeatability by optimizing controller settings for each sheet thickness and material combination, reducing rejects and thermal/mechanical stress on electrodes, while preventing welding spatter and maintaining precise control during edge welds.
Implementation Method 1
A resistance welding device with a welding control system that adjusts controller parameters, such as proportional gain and reset time, specifically for each sheet thickness and material combination
Data Source
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AI summary
A resistance welding device with a welding control for controlling a welding tool is disclosed, wherein the welding control comprises an assignment device and a first controller, and the assignment device is configured to read a current point to be welded from a list of points to be welded, to read a first setpoint curve from a data record of a database assigned to the current point to be welded, and to assign the first setpoint curve to the first controller, and the first controller is configured by means of at least one first parameter to control a time profile of an electric current at the current point to be welded according to the first setpoint curve, wherein, according to the invention, the data record in the database has at least one first value for the first parameter, and the assignment device has a parameterization device configured toto read the first value from the data set of the point currently being welded and to use this first value to parameterize the first parameter of the first controller.