Resistance Welding Control Using Weld Inspection Feedback
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Solution Overview
Problem
Existing resistance welding systems face challenges in maintaining consistent weld quality and productivity due to electrode deformation and changing weld zone structures, leading to degraded inspection values.
Innovation Solution
A control device that monitors inspection values from weld zones formed by resistance welding, adjusts setting values for current and pressure based on these values, and decides whether to perform resistance spot welding, thereby improving weld quality and avoiding unnecessary stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resistance welding is performed continuously to maintain high productivity, then output increases, but weld quality degrades due to electrode deformation and changing weld zone structures
Solution Approach 1:
The system implements real-time feedback by monitoring inspection values (such as ultrasonic inspection results or electrical resistance measurements) during continuous welding operations. Based on this feedback, the control device dynamically adjusts welding parameters including current magnitude, pressure force, and welding duration to maintain consistent weld quality despite electrode deformation and weld zone structure changes
Solution Approach 2:
The invention dynamically changes welding parameters (current, pressure, time) based on monitored inspection values. When inspection values indicate degradation trends, the system automatically adjusts parameters such as increasing current magnitude or modifying pressure force to compensate for electrode deformation and maintain manufacturing precision throughout continuous operation
2Manufacturing precision
If welding parameters are adjusted frequently to maintain weld quality, then manufacturing precision improves, but system complexity increases
Solution Approach 1:
The control device automatically monitors inspection values and adjusts welding parameters without requiring external intervention or complex manual control systems. The system serves itself by detecting quality degradation trends and autonomously modifying parameters, thereby maintaining manufacturing precision while avoiding the need for overly complex control architectures
3Reliability
If welding stops are made early to prevent defective welds, then reliability improves, but productivity decreases due to unnecessary stops
Solution Approach 1:
The system performs preliminary monitoring of inspection values to detect early signs of quality degradation before actual defects occur. By identifying trends such as gradual inspection value decline or parameter drift, the system takes preliminary corrective actions by adjusting welding parameters, thereby preventing defective welds without requiring premature production stops
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
The system effectively improves weld quality by dynamically adjusting welding parameters and reduces downtime by preventing premature stops due to minor inspection value degradations, thus enhancing productivity.
Implementation Method 1
In resistance welding, multiple overlaid members are melted by heat by causing a current to flow in the members
Data Source
AI summary
According to one embodiment, a control device controls a welding device performing resistance welding. When an inspection value satisfies a first condition, the control device modifies a setting value for the resistance welding and causes the welding device to perform the resistance welding. The inspection value is obtained by an inspection of a weld zone formed by the resistance welding. The control device does not cause the welding device to perform the resistance welding when the inspection value satisfies a second condition.