Truncated-Cone Spot Welding Tip for Short Flange Cooling
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Solution Overview
Problem
Existing spot welding techniques for aluminum panels with short flanges face issues such as interference, separation and spatter phenomena, limited cooling performance, and frequent tip deterioration due to high heat generation, which affect welding quality and efficiency.
Innovation Solution
A spot welding tip with a cylindrical mounting portion and a truncated cone-shaped head portion, featuring a smaller fore end diameter and optimized curvature, is designed to minimize heat generation and improve cooling, ensuring a larger contact area and reducing interference with short flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If dome type welding tips with small fore end diameter are used to cope with short flange limitations, then the welding tip can access the short flange area, but the contact area is small causing limited cooling performance and excessive heat generation
Solution Approach 1:
The patent changes the geometric parameters of the welding tip by transitioning from a dome shape to a truncated cone shape with optimized dimensions. The fore end diameter is set to 10mm and the rear end diameter to 16mm, creating a tapered structure that increases contact area while maintaining access to short flanges. This parameter optimization resolves the contradiction between accessing short flanges and maintaining adequate cooling performance.
2Ease of operation
If dome type welding tips are used for short flange welding, then the welding tip can contact the short flange, but separation and spatter phenomena occur at the end portion of the short flange
Solution Approach 1:
The patent applies curvature to the fore end portion of the truncated cone-shaped tip, creating a rounded contact surface that distributes pressure and heat more evenly across the contact area. This curved surface design prevents concentration of stress and heat at single points, thereby eliminating separation and spatter phenomena while maintaining good contact with the short flange surface.
3Temperature
If cap tip diameter of spot welding machine is large (e.g., 20 mm), then the welding tip has sufficient contact area for cooling, but it causes interference with curved portion of the short flange and geometric constraints
Solution Approach 1:
The welding tip is segmented into distinct zones with different diameters: a smaller fore end diameter (10mm) for accessing the short flange area, a larger rear end diameter (16mm) for adequate cooling, and a mounting portion diameter (20mm) for structural support. This segmentation allows each zone to fulfill its specific function, resolving the contradiction between cooling requirements and geometric compatibility.
4Length of moving object
If dome type welding tips with small contact area are used, then the welding tip can access short flange areas, but frequent tip dressing is required due to aluminum fusion
Solution Approach 1:
The patent optimizes the dimensional parameters of the welding tip, specifically setting the fore end diameter to 10mm and rear end diameter to 16mm. These parameter changes create an optimal contact area that prevents excessive heat generation and aluminum fusion, thereby reducing the frequency of tip dressing operations and improving overall welding productivity.
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 optimized spot welding tip maintains lower surface temperatures, enhances welding quality by securing larger nugget diameters, and extends the tip's lifespan by reducing the need for frequent dressing, while maintaining consistent performance across varying panel thicknesses.
Implementation Method 1
applying pressure and generating heat through electrical resistance
Implementation Method 2
generating heat through electrical resistance
Implementation Method 3
a cooling unit configured to cool the plurality of spot welding tips
Data Source
AI summary
A spot welding tip for a short flange of a car body panel may include a tip mounting portion having a cylindrical structure and forming a closed upper surface, and a truncated cone-shaped tip head portion formed in a vertical direction from a center of the upper surface of the tip mounting portion, wherein a fore end diameter of the tip head portion is formed to be smaller than a diameter of the tip mounting portion. A spot welding machine may include and/or operate with the spot welding tip