TIG Welding Torch Permanent Magnet Oscillation
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Solution Overview
Problem
Conventional TIG welding methods using permanent magnets to generate a magnetic field around the weld arc struggle to achieve a higher aspect ratio weld zone cross-sectional shape and often result in overheating of the magnets due to heat radiation from the weld arc.
Innovation Solution
The method involves arranging permanent magnets around the welding torch electrode and moving them to fluctuate the magnetic field, generating an electromotive force and eddy current that increases the Lorentz force on the weld pool, enhancing inward convection and achieving a higher aspect ratio weld zone, while also accelerating heat conduction to prevent magnet overheating through cyclic motion in the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If permanent magnets are arranged around the electrode to generate a magnetic field, then electromagnetic force acts on the weld pool, but the aspect ratio of the weld zone cannot be improved and the magnets overheat due to heat radiation
Solution Approach 1:
The patent applies the dynamics principle by making the permanent magnets movable rather than fixed. The magnets are driven to oscillate in the axial direction by a driving mechanism, which dynamically changes the magnetic field distribution. This dynamic movement serves dual purposes: it enhances inward convection in the weld pool to improve aspect ratio, and it prevents heat accumulation by continuously changing the thermal interaction between magnets and weld arc, thereby resolving the overheating problem
Solution Approach 2:
The patent implements periodic action through the oscillatory movement of permanent magnets along the axial direction. The magnets undergo cyclic motion with a specific frequency and amplitude, creating periodic fluctuations in the magnetic field. This periodic action enhances the stirring effect on the weld pool to achieve higher aspect ratio, while also preventing continuous heat exposure to the magnets, thus resolving the thermal management issue
2Manufacturing precision
If permanent magnets are stationary around the electrode, then the magnetic field is stable, but the Lorentz force is insufficient to achieve higher aspect ratio weld zone
Solution Approach 1:
The patent transforms the static magnetic field configuration into a dynamic one by implementing oscillatory movement of permanent magnets. This dynamic configuration generates time-varying magnetic fields that interact with the weld pool current to produce enhanced and fluctuating Lorentz forces. The dynamic Lorentz force creates stronger inward convection currents in the weld pool, thereby achieving the desired higher aspect ratio that cannot be obtained with stationary magnets
3Manufacturing precision
If permanent magnets are moved to fluctuate the magnetic field, then eddy current increases the Lorentz force and aspect ratio, but the mechanism of heat dissipation must be explained
Solution Approach 1:
The patent applies the 'blessing in disguise' principle by converting the harmful heat radiation from the weld arc into a beneficial effect. The oscillatory movement of permanent magnets prevents continuous thermal exposure, allowing heat to dissipate during the reverse motion phases. This converts the potential harmful overheating into a controlled thermal process where heat is continuously managed, and the magnetic field fluctuations simultaneously generate beneficial eddy currents that enhance welding performance
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 results in a deeper and narrower weld pool with a higher aspect ratio cross-sectional shape and prevents permanent magnet overheating by enhancing heat dissipation, leading to improved welding efficiency and quality.
Implementation Method 1
uses permanent magnets to cause the generation of a magnetic field around the weld arc
Implementation Method 2
make electromagnetic force which is generated due to electromagnetic interaction of the magnetic field and current act on a weld pool
Implementation Method 3
moving the permanent magnets to make the magnetic field fluctuate and thereby make the Lorentz force which is applied to the weld pool fluctuate
Data Source
AI summary
A TIG welding method and apparatus which enable a higher aspect ratio weld zone cross-sectional shape to be obtained and which further can prevent the heat radiated from the weld arc causing the permanent magnets to overheat, specifically a TIG welding method which causes an arc discharge between a workpiece and an electrode of a welding torch to cause the generation of a weld arc, uses permanent magnets to generate a magnetic field around the weld arc, and causes an electromagnetic force which is generated by electromagnetic interaction between the magnetic field and a current to act on a weld pool of the workpiece in welding, the TIG welding method arranging the permanent magnets around the electrode of the welding torch and moving the permanent magnets to make the magnetic field fluctuate and thereby make the drive force of convection which is applied to the weld pool fluctuate.