Welding Torch Orientation Calibration Without a Magnetometer
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Solution Overview
Problem
Conventional welding systems rely on magnetometers for measuring three-dimensional welding torch orientation, which can be inaccurate and require additional components, limiting precision and efficiency.
Innovation Solution
A welding system that uses an inertial measurement unit (IMU) with accelerometers and gyroscopes to determine the orientation of the welding torch without a magnetometer, employing equations to calculate rotational angles and update sensor outputs for precise position and velocity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetometer is used to measure welding torch orientation, then the system can obtain orientation data, but the measurement accuracy decreases and system complexity increases
Solution Approach 1:
The patent removes the magnetometer from the sensor system, extracting only the necessary components (accelerometers and gyroscopes) to achieve the measurement function. This eliminates the problematic magnetometer while maintaining orientation measurement capability through alternative sensors that are not susceptible to magnetic interference.
Solution Approach 2:
The patent replaces the magnetometer-based magnetic field measurement system with an inertial measurement system using accelerometers and gyroscopes. This substitution uses mechanical and inertial principles instead of magnetic field detection, thereby avoiding magnetic interference issues and improving measurement reliability in electrically noisy welding environments.
2Ease of operation
If a magnetometer is included in the welding system, then the system can measure orientation, but the system complexity and component count increase
Solution Approach 1:
The magnetometer is completely removed from the system architecture. The patent demonstrates that orientation measurement can be achieved using only accelerometers and gyroscopes, thereby reducing the component count and simplifying the overall system structure while maintaining full functionality.
Solution Approach 2:
The inertial measurement unit (IMU) combining accelerometers and gyroscopes serves multiple functions: it provides both static orientation measurement and dynamic motion tracking. This multi-functional approach replaces the specialized magnetometer, reducing total component count while enhancing operational capability.
3Reliability
If magnetometer outputs are used for orientation determination, then the system can function, but measurement accuracy is compromised due to magnetic interference
Solution Approach 1:
The patent replaces the magnetic field-based measurement system with an inertial measurement system that is immune to magnetic interference from welding currents and equipment. Accelerometers and gyroscopes provide reliable orientation data without being affected by the electrically noisy welding environment, thereby improving both reliability and precision.
Solution Approach 2:
The patent acknowledges that magnetic interference is inevitable in welding environments, but instead of trying to eliminate it, the system uses sensors (accelerometers and gyroscopes) that are inherently immune to such interference. This converts the harmful magnetic environment into a non-problematic condition for the chosen sensor type.
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 eliminates the need for magnetometers, enhancing accuracy and reducing system complexity while providing real-time feedback for improved welding precision and training effectiveness.
Implementation Method 1
an inertial measurement unit (IMU) with accelerometers and gyroscopes to determine the orientation of the welding torch
Implementation Method 2
an inertial measurement unit (IMU) with accelerometers and gyroscopes to determine the orientation of the welding torch
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A welding system is configured to calibrate a welding torch's orientation without using a magnetometer. The welding system comprises: a sensor, mounted rigidly to a welding torch, configured to output a first output, a second output, and a third output corresponding to a first axis, a second axis, and a third axis of a coordinate system, respectively, wherein the first axis, the second axis, and the third axis are mutually orthogonal to each other; and a welding controller configured to: determine, based on the first output, the second output, and the third output, a first rotational angle for the sensor to determine a first intermediate coordinate system with respect to a reference coordinate system, and a second rotational angle for the sensor to determine a second intermediate coordinate system with respect to the first intermediate coordinate system; and calibrate an orientation of the sensor based on the second intermediate coordinate system.