Magnetic Spot Welding Electrode for Surface Spatter Suppression
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Solution Overview
Problem
Resistance spot welding of ultra-high-strength steel plates often results in surface spatter due to increased heat generation and springback phenomenon, leading to deteriorated weld quality and spatter formation when electrodes are in an inclined position.
Innovation Solution
An electrode for resistance spot welding equipped with a magnetic unit that generates a magnetic field and Lorentz force, preventing the nugget from splashing by directing its growth in a transverse direction, thereby suppressing surface spatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resistance spot welding is performed on ultra-high-strength steel plates, then welding strength is improved, but surface spatter occurs due to increased heat generation and springback phenomenon
Solution Approach 1:
The invention utilizes the springback phenomenon and increased material resistance, which normally cause spatter, by introducing a magnetic field that generates Lorentz force. This force redirects the harmful splashing molten metal back into the weld zone, converting the spatter-generating effects into beneficial forces that improve weld quality while maintaining the strength benefits of welding ultra-high-strength steel plates
Solution Approach 2:
The invention changes the physical state and behavior of the molten nugget by applying a magnetic field during welding. The magnetic field parameters (strength, direction) are controlled to generate appropriate Lorentz force that prevents spatter while maintaining the welding strength requirements for ultra-high-strength steel plates
2Adaptability or versatility
If electrodes are positioned in an inclined state to accommodate springback, then weldability is improved, but current density concentrates at contact parts causing expanded melting and surface spatter
Solution Approach 1:
The invention converts the harmful concentrated current density and expanded melting caused by inclined electrode positioning into beneficial effects by applying a magnetic field. The Lorentz force generated by the magnetic field redirects the molten metal flow, preventing spatter while allowing the electrodes to maintain the inclined positioning needed for accommodating springback in ultra-high-strength steel plates
Solution Approach 2:
The magnetic field acts as an intermediary between the inclined electrodes and the molten nugget. It mediates the interaction by generating Lorentz force that controls the molten metal flow, allowing the electrodes to remain in the inclined position required for weldability while preventing the spatter that would normally result from such positioning
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 magnetic unit effectively suppresses surface spatter and controls the nugget growth, enhancing weld quality by preventing splashing and adjusting the nugget size and shape through the positioning and polarity of the permanent magnet.
Implementation Method 1
A magnetic unit is installed on an outer peripheral surface of the shank to form a magnetic field and form a Lorentz force in a direction of rotation along a circumferential direction of the shank by the magnetic field and a current flowing through the shank
Implementation Method 2
A magnetic unit is installed on an outer peripheral surface of the shank to form a magnetic field... The magnetic unit effectively suppresses surface spatter and controls the nugget growth, enhancing weld quality by preventing splashing
Data Source
AI summary
An electrode and a device for resistance spot welding are capable of preventing an occurrence of a surface spatter by using magnetism. The electrode may include a shank and a welding tip mounted to an end of the shank. A magnetic unit is installed on an outer peripheral surface of the shank to form a magnetic field and to form a Lorentz force in a direction of rotation along a circumferential direction of the shank by the magnetic field and a current flowing through the shank.