Spot Welding Electrode Tip Structure for Lower-Current Joining
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Solution Overview
Problem
The existing electrode configuration for resistance spot welding, with sawteeth-shaped projection and recess portions, increases the welding current value and energy requirements, leading to electrode melting and adherence issues, and environmental concerns due to larger power supply devices.
Innovation Solution
An electrode tip portion with independent and dispersed recess portions and a continuous projection surface, which reduces current path enlargement and ensures high current density, allowing efficient metal joining with lower energy consumption by distributing current uniformly and preventing local concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode tip portion is configured with sawteeth-shaped projection and recess portions to destroy oxidation film, then the oxidation film destruction capability is improved, but the welding current value and energy consumption significantly increase
Solution Approach 1:
The electrode tip portion is configured with a convex portion having a curved surface that protrudes from the tip, creating localized high-current-density regions. This local quality modification allows the oxidation film to be destroyed at specific protruding regions while maintaining lower overall energy consumption, as the current concentrates on the convex portion rather than distributing uniformly across the entire electrode surface.
Solution Approach 2:
The convex portion is formed with a curved surface instead of a flat or sawteeth shape. This curvature creates a focal point for current concentration that efficiently destroys the oxidation film while requiring less total energy. The curved geometry naturally guides and concentrates the welding current to the tip region, achieving oxidation film removal with reduced energy input compared to angular or planar configurations.
2Use of energy by moving object
If the electrode tip portion has a flat surface configuration, then the contact area is large and current distribution is uniform, but the oxidation film cannot be effectively destroyed
Solution Approach 1:
Instead of modifying the entire electrode surface, only a convex portion is created at the tip region. This localized modification creates the necessary current concentration for oxidation film destruction without requiring complex surface treatments across the whole electrode, maintaining simplicity while achieving the desired effect.
Solution Approach 2:
The curved surface of the convex portion creates a natural current concentration effect at the electrode tip. This curvature geometry focuses the welding current to a smaller effective area, enabling oxidation film destruction without needing to treat the entire electrode surface, thus maintaining energy efficiency.
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 proposed electrode configuration effectively reduces the energy needed to achieve the target nugget diameter while preventing electrode melting and adherence, enhancing reliability and reducing environmental impact by minimizing energy consumption and power supply size.
Implementation Method 1
a projection portion and a recess portion with the shape of sawteeth are provided to destroy an oxidation film present on surfaces of the metal plate materials
Implementation Method 2
join the metal plate materials to one another through energization
Data Source
AI summary
An electrode tip portion is provided with a projection portion and a plurality of recess portions. The plurality of the recess portions are independent of one another, and are provided at the electrode tip portion in a dispersed manner. The projection portion is a region other than regions where the recess portions are provided, and is configured to be equipped with a continuous surface that continues in regions among the plurality of the recess portions.