Arc Welding Head Optical Detection for Reliable Arc State Sensing
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Solution Overview
Problem
Conventional arc welding processes face challenges in accurately detecting the state of an electric arc due to interference from high currents and multiple welding devices, leading to false short-circuit detection, especially in robotic or automated systems.
Innovation Solution
A joining device that utilizes a light-receiving element to detect the electromagnetic radiation emitted by the arc, generating a light intensity signal for precise arc state determination, separate from conventional electrical parameter measurements, with an evaluation unit to control the welding process based on this signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage measurements are used for arc detection, then the detection system is simple to implement, but the detection accuracy deteriorates due to interference from high currents and multiple welding devices
Solution Approach 1:
The patent replaces the electrical measurement system (voltage/current sensors) with an optical detection system (light receiving element). The light receiving element detects electromagnetic radiation from the arc, converting it to electrical signals that are processed to determine arc state. This substitution eliminates susceptibility to electrical interference from multiple welding devices while maintaining arc detection functionality.
Solution Approach 2:
The patent introduces electromagnetic radiation (light) as an intermediary medium between the arc and the detection system. Instead of directly measuring electrical parameters that are susceptible to interference, the system detects light emitted by the arc, which serves as an indirect but interference-free indicator of arc state.
2Measurement precision
If additional voltage measuring leads are used to decouple voltage measurement, then the measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The patent replaces the complex electrical decoupling approach (additional measuring leads, isolation circuits) with a fundamentally different optical measurement approach. The light receiving element naturally provides electrical isolation since it detects optical signals rather than electrical signals, eliminating the need for complex decoupling circuitry while maintaining measurement accuracy.
3Device complexity
If voltage measuring lines are laid near welding lines, then the measurement system is compact, but the reliability deteriorates due to electrical interference
Solution Approach 1:
The patent substitutes electrical signal transmission with optical signal transmission. The light receiving element converts optical energy from the arc into electrical signals, which are then transmitted. This optical-to-electrical conversion at the source eliminates susceptibility to electromagnetic interference along the signal transmission path, maintaining reliability even with compact cable routing.
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
Enhances arc detection accuracy by isolating the light-receiving element from interference, allowing for precise control of welding parameters and reducing false detections, thus improving the reliability of automated welding processes.
Implementation Method 1
a light receiving element; and an evaluation device designed to receive a current light intensity signal, which includes light intensity information about a light intensity at the light receiving element
Data Source
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AI summary
The invention provides a method for joining a workpiece and a joining device. The joining device (100-700) comprises: a joining head (110; 310-710) configured to generate an electric arc (2) and thereby transfer energy to the workpiece (9) for joining; a light-receiving element (121-721); and an evaluation device (130; 230) configured to receive a current light intensity signal, which includes information about the light intensity at the light-receiving element (121-721), and which is also configured to determine, based on the light intensity signal, whether an electric arc (2) is currently burning.