Spot Welding Cap Tip Assembly for Narrow Vehicle Flanges
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Solution Overview
Problem
Existing spot welding apparatuses face challenges in reducing the width of the flange in vehicle body parts, which affects the weight of the vehicle, as the electrode contact area needs to be minimized while maintaining welding performance.
Innovation Solution
A cap tip assembly with a rectangular block shape featuring a round welding section, non-welding section, and collet member design that reduces the electrode contact area by using a predetermined curvature and melt diffusion sections, along with conductive tape transport tracks to prevent fusion products from adhering, allowing for efficient spot welding of flanges with a shorter width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the electrode contact area is reduced to minimize flange width, then vehicle weight is reduced, but welding performance deteriorates
Solution Approach 1:
The cap tip applies local quality by creating a concentrated welding area with specific curvature radius at the contact point, while the rest of the electrode surface has different properties. This allows minimal contact area for weight reduction while maintaining welding quality through optimized local geometry
Solution Approach 2:
The invention uses spherical curvature on the welding surface of the cap tip with a specific radius (R1) that is larger than the curvature radius of the non-welding surface (R2). This curvature design concentrates the welding effect at a small contact area, enabling flange width reduction while preserving welding performance
2Length of moving object
If the electrode contact area is reduced, then flange width is reduced, but spot welding performance deteriorates
Solution Approach 1:
The cap tip design creates local quality differentiation between the welding surface and non-welding surfaces. The welding surface has optimized curvature and contact area specifically tailored for high-quality spot welding, while the overall electrode contact area with the flange is minimized to achieve narrow flange width
Solution Approach 2:
By applying spherical curvature with radius R1 to the welding surface that is larger than the curvature radius R2 of other surfaces, the invention concentrates welding energy at a precise location. This enables effective spot welding performance with minimal flange width
3Reliability
If conductive tape is supplied to prevent fusion product adhesion, then welding quality is improved, but device complexity increases
Solution Approach 1:
The conductive tape acts as an intermediary material between the electrode and the workpiece. It prevents fusion products from adhering to the cap tip while maintaining electrical conductivity for welding. The tape is supplied and recovered automatically, adding minimal complexity to the existing welding apparatus
Solution Approach 2:
The conductive tape is designed to be disposable - it is supplied to the welding area, performs its function of preventing adhesion, and then is recovered and replaced. This approach maintains high welding quality without requiring complex cleaning or maintenance systems for the electrode itself
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 cap tip assembly enables spot welding of flanges with a shorter width, reducing vehicle weight while maintaining welding performance and preventing fusion products from adhering to the tip, thus enhancing the assembly process.
Implementation Method 1
a spot welding apparatus for supplying a conductive tape to the cap tip or recovering the conductive tape from the cap tip has been developed in order to prevent a welding fusion product from adhering to the cap tip
Implementation Method 2
The cap tip applied to the spot welding apparatus forms an electrode surface (commonly referred to as an 'electrode contacting surface' by those skilled in the art) for pressurization and conduction of the object to be welded
Data Source
AI summary
A cap tip assembly for spot welding is disclosed. The cap tip assembly for spot welding is configured to spot-weld a first base material in which a flange is formed and a second base material overlapping the flange in a vertical direction. The cap tip assembly for spot welding includes a tip body provided in a shape of a rectangular block in which a round-shaped welding section is formed on a front side of a top surface, and a collet member coupled to the tip body to guide a conductive tape to the welding section.