Stud Welding Gas Cover Layout for Oxidation-Free Bonding
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Solution Overview
Problem
Existing welding devices for attaching studs to substrates face challenges in efficiently preventing oxidation at the welding point, particularly in applications like building and shipbuilding, where uniform inert gas flow is crucial to avoid oxidation and ensure strong bonding.
Innovation Solution
A welding device featuring an inert gas cover with a ring-shaped inlet and offset outlet, ensuring uniform radial and axial inert gas flow around the welding axis, effectively displacing oxygen and preventing oxidation, while the holding device securely positions the stud during the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inert gas flows past the welding point to displace oxygen, then oxidation prevention is improved, but uniform flow distribution and complete oxygen displacement are insufficient
Solution Approach 1:
The inert gas inlet is divided into multiple inlet channels arranged circumferentially around the welding axis, and the outlet is divided into multiple outlet channels also arranged circumferentially. This segmentation allows gas to enter and exit at multiple points around the circumference, creating more uniform flow distribution and better oxygen displacement throughout the welding zone.
Solution Approach 2:
The outlet channels are positioned asymmetrically offset from the inlet channels in the circumferential direction. This asymmetric arrangement creates an optimized flow path where gas enters through inlet channels, flows radially inward toward the welding point, and exits through outlet channels positioned downstream, ensuring complete coverage and displacement of oxygen from the welding zone.
2Productivity
If high current intensity is used to provide energy for liquefying material quickly, then welding speed is improved, but cable rating requirements increase
Solution Approach 1:
The invention changes the electrical parameters by using very high current intensity (several kiloamperes) for extremely short durations (microseconds to milliseconds). This pulsed high-current approach provides sufficient energy for rapid material liquefaction and welding completion while allowing the use of cables with lower continuous current ratings, as the cables only need to handle brief current pulses rather than continuous high current.
3Volume of moving object
If the outlet distance is too small, then device compactness is improved, but uniform radial gas flow to the welding point cannot be achieved
Solution Approach 1:
The inlet channels are arranged circumferentially around the welding axis rather than in a single plane, creating a three-dimensional gas distribution pattern. Gas enters through multiple circumferentially distributed inlet channels and flows radially inward from all directions around the welding point, ensuring uniform coverage. The outlet channels are similarly arranged circumferentially at an optimized distance, maintaining compact dimensions while achieving uniform flow through spatial distribution in multiple dimensions.
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 device ensures a strong, oxidation-free bond between the stud and substrate by maintaining a uniform inert gas flow pattern, enhancing the fastening process and preventing ambient air from reaching the welding point, thus improving the quality of the weld.
Implementation Method 1
the inert gas flows uniformly from all directions radially to the welding point and then essentially axially away from the welding point
Implementation Method 2
an electrical current is applied to it. As soon as the electrical current flows between the stud and the substrate, the stud is lifted off the substrate to form an arc. The energy that is released causes the material of the stud and the substrate to be partially liquefied.
Data Source
AI summary
A welding device for welding a stud to a substrate along a welding axis in a welding direction, comprising an inert gas cover with an inert gas inlet arranged as a ring around the axis, with an inert gas outlet, and an opening facing the welding direction, the opening having transversely to the welding direction an opening diameter, wherein the inert gas inlet is at an inlet distance from the opening counter to the welding direction, wherein the inert gas outlet is at an outlet distance from the opening counter to the welding direction, and a holding device holding the stud within the cover during welding, the holding device having an outside diameter and a stud receptacle with an inside diameter, wherein the outlet distance is at least half of a difference between the opening diameter and the outside diameter or at least the same size as the inlet distance.