Induction Heating Head Feedback Control for Moving Weld Paths
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Solution Overview
Problem
Conventional induction heating methods for pre-heating weld paths in steel welding, such as using gas-fired torches or induction blankets, face challenges with moving workpieces, particularly in pipe welding applications, as they lack temperature and travel feedback control, leading to inefficient heating and potential cracking due to improper filler metal binding.
Innovation Solution
An induction heating system with a moveable induction heating head assembly, integrated temperature and travel sensor assemblies, and a power source that adjusts power based on feedback signals to ensure consistent pre-heating across the weld path, eliminating the need for transformers and providing precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional induction heating methods (induction blankets) are used for stationary workpieces, then heating effectiveness is improved, but adaptability to moving workpieces deteriorates
Solution Approach 1:
The patent applies the dynamics principle by transitioning from static induction blankets to a dynamic system with a moveable induction heating head assembly that can track and follow the movement of the workpiece. The heating head is mounted on a movable cart or rail system that allows it to dynamically adjust its position relative to the workpiece, maintaining optimal heating effectiveness while adapting to moving workpieces in pipe welding applications.
2Device complexity
If conventional heating devices are placed at one location and then moved, then simplicity of device structure is improved, but heating consistency deteriorates
Solution Approach 1:
The patent implements feedback control by incorporating temperature sensors that continuously monitor the workpiece temperature and travel sensors that track the position and movement of the induction heating head. This feedback information is fed to a controller that automatically adjusts the heating power and head position to maintain consistent heating throughout the weld path, eliminating the heating inconsistencies that occur when manually moving simple heating devices.
3Manufacturing precision
If temperature feedback control is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent incorporates temperature feedback control systems with sensors positioned to monitor the workpiece temperature in real-time. The sensor data is fed to a controller that automatically adjusts the induction heating power output to maintain the desired temperature profile along the weld path. This feedback mechanism significantly improves pre-heating precision by ensuring consistent temperature control, preventing both overheating and underheating that could compromise 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
The system ensures efficient and consistent pre-heating of steel weld paths, reducing the risk of cracking by maintaining optimal filler metal binding, even with moving workpieces, through real-time temperature and movement feedback control.
Implementation Method 1
induction heating system having an induction heating head assembly configured to move relative to a workpiece
Implementation Method 2
induction heating can be a fast and reliable way to pre-heat
Data Source
AI summary
An induction heating system includes an induction heating head assembly configured to move relative to a workpiece. The induction heating system may also include a temperature sensor assembly configured to detect a temperature of the workpiece and/or a travel sensor assembly configured to detect a position, movement, or direction of movement of the induction heating head assembly relative to the workpiece, and to transmit feedback signals to a controller configured to adjust the power provided to the induction heating head assembly by a power source based at least in part on the feedback signals. In certain embodiments, the induction heating system may also include a connection box configured to receive the feedback signals, to perform certain conversions of the feedback signals, and to provide the feedback signals to the power source. Furthermore, in certain embodiments, the induction heating system may include an inductor stand assembly configured to hold the induction heating head assembly against the workpiece.