Weld Stud Convex End Face Arc Migration
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Solution Overview
Problem
Conventional welding studs for drawn arc welding often result in uneven melting and poor joint quality due to the arc migrating to specific points, leading to weakened joints and process sensitivity.
Innovation Solution
A welding stud with an outwardly curved end face, preferably rotationally symmetrical and shaped as a spherical segment, ellipsoidal segment, or paraboloidal segment, which merges smoothly into the side face, reducing arc migration and ensuring uniform melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional welding stud with a flat end face is used, then the welding process is simple, but the arc migrates to specific points causing uneven melting and poor joint quality
Solution Approach 1:
The patent applies the spheroidality principle by replacing the conventional flat end face with a convex curved end face. This curvature prevents the arc from concentrating at specific points or edges, thereby eliminating uneven melting and improving weld joint quality. The convex shape distributes the arc energy uniformly across the end face surface, directly resolving the technical contradiction between manufacturing precision and device complexity.
2Reliability
If the end face is made convex to prevent arc migration, then uniform melting is achieved, but the manufacturing complexity increases
Solution Approach 1:
The convex curved end face design implements the spheroidality principle to improve reliability by preventing arc migration and ensuring uniform melting. While this increases manufacturing complexity compared to a flat surface, the patent demonstrates that the curved geometry can be achieved through standard manufacturing processes, making the trade-off acceptable for the significant improvement in weld joint quality and process reliability.
3Productivity
If excessive welding energy is applied, then the welding process is faster, but material vaporization occurs at the edge compromising joint strength
Solution Approach 1:
The convex curved end face prevents excessive welding energy from concentrating at the edges, thereby preventing material vaporization while maintaining welding speed. The curvature distributes the arc energy uniformly across the end face, allowing for efficient welding without compromising joint strength through edge vaporization.
Solution Approach 2:
The patent applies parameter changes by modifying the geometric parameters of the end face from flat to convex curved. This geometric parameter change fundamentally alters how welding energy is distributed, preventing the harmful concentration of energy at edges that leads to vaporization, while still maintaining productive welding speeds.
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 design achieves consistent and improved joint quality by preventing arc concentration, enhancing the strength and reliability of the welds, making them less sensitive to process disturbances.
Implementation Method 1
an electric arc is ignited between the stud's end face and the component
Implementation Method 2
Both parts are melted and joined together
Implementation Method 3
the arc does not migrate to a specific point, which significantly improves the uniformity of the melting process
Data Source
Figure 1
Figure 2
AI summary
A weld stud for drawn-arc stud welding has a functional portion and a welding portion which represents one end of the weld stud and which is delimited by a front face that is curved outwards in a longitudinal direction of the weld stud.