Galvanized Ball Arc Welding for Reproducible Auto Joints
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Solution Overview
Problem
Existing methods for welding ball-component connections in automobile construction lack reliability and consistency, especially in mass production, where the strength and reproducibility of the welded connection are critical and require minimal adjustments across different batches.
Innovation Solution
The method employs drawn arc welding with DC current, using a galvanized ball with specific roundness and zinc inclusion criteria, and a three-phase main current strategy to ensure strong and reproducible welds, maintaining connection strength across different production batches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If resistance welding is used for ball-component connections, then the joining process can be automated, but the reliability and consistency of the welded connection across different batches deteriorates
Solution Approach 1:
The patent applies parameter changes by transitioning from resistance welding to drawn arc welding with DC current, which fundamentally changes the welding mechanism. This parameter change enables automated welding while achieving consistent, reliable welded connections across different batches, as the drawn arc process provides better control over the welding arc and material melting.
Solution Approach 2:
The patent replaces the resistance welding mechanism with drawn arc welding. This substitution involves using an electric arc to melt the materials instead of relying on electrical resistance at the contact point, providing more consistent and controllable welding results in automated production.
2Strength
If drawn arc welding is used with galvanized balls, then welding strength is improved, but spatter and zinc inclusion problems occur
Solution Approach 1:
The patent applies parameter changes by specifying precise parameters for the galvanized balls, including zinc layer thickness of 6-12 micrometers, roundness of G500, and maximum zinc inclusion size of 10 micrometers. These parameter specifications optimize the welding process to achieve strong connections while minimizing spatter and harmful zinc inclusions.
Solution Approach 2:
The patent applies local quality by ensuring uniform galvanizing with controlled zinc layer thickness and roundness across the ball surface. This localized control of material properties ensures consistent welding performance and reduces variability in welded connection quality.
3Productivity
If mass production is implemented, then productivity is increased, but manufacturing precision and consistency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-specifying the ball parameters (material C10C, galvanizing thickness 6-12 µm, roundness G500, maximum zinc inclusion 10 µm) before the welding process. This preliminary preparation ensures that all balls meet consistent quality criteria, enabling mass production while maintaining high manufacturing precision and welded connection consistency.
Solution Approach 2:
The patent uses parameter changes by defining specific material and geometric parameters for the balls that optimize both automated welding performance and connection consistency. These parameter specifications enable scalable production without sacrificing precision.
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 controlled and reproducible welding process with increased strength and reduced spatter, allowing for consistent production without significant parameter adjustments across different batches, suitable for mass production in vehicle construction.
Implementation Method 1
The resultant welding arc causes at least partial melting of the materials of the welded part and the component
Implementation Method 2
an electric voltage is applied, so that an electric current flows between the ball and the component. As a result, material in the region of the contact point melts
Implementation Method 3
The welded part is removed to a predetermined distance from the component. This brings about the formation of a weak arc
Data Source
AI summary
A method for welding a welded part to a component is carried out as arc ignition welding by use of direct current, having a bias current phase in which an arc is formed between the negatively polarized welded part and the component, and a subsequent main current phase for melting material to the joint. The welded part: a) is a galvanized sphere made of C10C having a roundness G500, wherein the size of any zinc inclusions under the surface of the sphere equals 10 micrometers at maximum, orb) is formed by welding a galvanized sphere made of C10C having a roundness G500, wherein the size of any zinc inclusions under the surface of the sphere equals 10 micrometers at maximum, to a connection element.