Filler Wire Position Control Using Weld Pool Continuity Feedback
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Solution Overview
Problem
Current welding technologies require continuous operator monitoring or sophisticated machine-vision-based control systems to ensure accurate positioning of filler wires and heating heads, increasing costs and complexity, especially in laser additive welding.
Innovation Solution
A method and system that adjust the position of a filler wire relative to a weld pool by determining electrical continuity and moving the filler wire in specific directions to maintain or restore continuity, using a heating head that can move in conjunction with the filler wire to control the weld pool's position, thereby reducing the need for continuous human feedback or advanced control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous operator monitoring or machine-vision-based control systems are used to ensure accurate positioning of filler wire and heating head, then weld quality is maintained, but system complexity and operational costs significantly increase
Solution Approach 1:
The system uses the weld pool itself as the sensing mechanism by monitoring electrical continuity between the filler wire and substrate. The weld pool's natural electrical properties provide feedback about filler wire position, eliminating the need for external sensors or vision systems. The controller automatically adjusts filler wire position based on this self-provided feedback signal.
Solution Approach 2:
The system establishes a feedback loop where the electrical continuity status between filler wire and substrate is continuously monitored. When continuity is lost (indicating filler wire departure from weld pool), the controller receives this feedback and automatically adjusts the filler wire position to restore continuity, maintaining weld quality through closed-loop control.
2Measurement precision
If machine-vision-based control systems are implemented to monitor filler wire position continuously, then positioning accuracy is improved, but operational costs increase significantly
Solution Approach 1:
The system replaces complex mechanical vision systems with an electrical continuity sensing mechanism. Instead of using cameras, lenses, and image processing hardware to detect filler wire position, the system uses simple electrical contact detection between the filler wire and substrate, achieving equivalent positioning information with much simpler and cheaper components.
Solution Approach 2:
The electrical continuity signal serves as an intermediary that translates physical filler wire position into a detectable electrical signal. Rather than directly measuring position with sensors, the system uses the presence or absence of electrical continuity as a mediator to infer whether the filler wire is properly positioned in the weld pool.
3Reliability
If sophisticated control systems are used to maintain filler wire position, then weld quality is ensured, but the system becomes more complex and expensive
Solution Approach 1:
The weld pool provides its own positioning feedback through electrical continuity properties. The system leverages the inherent electrical characteristics of the molten metal to generate position information, eliminating the need for separate sensing systems and reducing operational complexity while maintaining reliable weld quality.
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 automates the positioning of filler wires and heating heads, reducing operational costs and complexity while maintaining weld quality by ensuring consistent electrical continuity between the filler wire and the weld pool, even with height variations in the substrate.
Implementation Method 1
supplying heat from the heating head to the substrate and to the weld pool
Implementation Method 2
determining whether an electrical continuity criterion, for electrical continuity between the filler wire and the weld pool, is met
Data Source
AI summary
A system and method for controlling the position of a filler wire and/or a laser head, or other heating head, in a welding system. The distal end of the filler wire is gradually moved, e.g., upward, until electrical continuity with the weld pool is lost; the filler wire is then moved back into contact with the weld pool. The heating head may be stationary relative to the weld pool, or it may move, with the distal end of the filler wire, relative to the weld pool.