Protective Gas Bell Layout for Uniform Stud Welding Shielding
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Solution Overview
Problem
Existing welding devices for attaching bolts to substrates face inefficiencies in energy delivery and oxidation prevention, particularly in applications like building and shipbuilding, where high current is required for rapid material liquefaction and protective gas distribution is crucial to prevent oxidation.
Innovation Solution
The welding device features a design with larger cross-sectional areas for connecting channels that open further from the input channel, a ring-shaped protective gas inlet and distribution chamber, and a protective gas bell with a collecting chamber and parallel second connecting channels, ensuring uniform gas flow and effective oxidation prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-intensity electric current is supplied to the stud via an appropriately dimensioned electrical cable, then the energy required to liquefy the stud material and substrate is delivered efficiently, but the electrical cable and associated energy delivery components become a bottleneck limiting further energy delivery capacity
Solution Approach 1:
The patent replaces the electrical cable-based energy delivery system with a mechanical contact-based system. The stud is mechanically contacted by a contactless energy transfer component that induces eddy currents directly in the stud, eliminating the need for high-current electrical cables and associated complex energy delivery infrastructure.
Solution Approach 2:
The patent employs periodic pulsed electromagnetic fields to deliver energy to the stud. Instead of continuous high-current electrical supply, short high-intensity pulses are applied through the mechanical contact, achieving the required energy delivery with reduced average power and simplified components.
2Reliability
If the contact point between the stud and substrate is flushed with shielding gas to prevent oxidation, then the liquefied material is protected from oxygen, but the distribution of shielding gas becomes uneven affecting weld quality
Solution Approach 1:
The shielding gas delivery system is segmented into multiple independent gas delivery points distributed around the welding zone. Instead of a single gas source, multiple nozzles or gas ports are positioned at different locations to ensure uniform shielding gas coverage across the entire contact area between stud and substrate.
Solution Approach 2:
The shielding gas distribution is optimized with different gas flow rates at different locations. Gas delivery is intensified at areas with higher oxidation risk or greater exposure to ambient air, while areas with natural shielding receive reduced gas flow, achieving uniform protection without excessive gas consumption.
3Ease of manufacture
If the cross-sectional area of connecting channels is uniform, then the manufacturing is simplified, but the protective gas flow distribution becomes non-uniform affecting welding quality
Solution Approach 1:
The connecting channels are designed with varying cross-sectional areas optimized for their specific locations in the gas distribution network. Channels closer to the gas source have smaller cross-sections, while channels farther away or serving multiple outlets have larger cross-sections, ensuring uniform gas flow distribution throughout the system.
Solution Approach 2:
The geometric parameters of the connecting channels, specifically the cross-sectional area, are systematically varied based on their position in the distribution network. This parameter optimization compensates for pressure drops and flow resistance variations, achieving uniform gas delivery to all welding zones.
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 enhances the fastening process by ensuring efficient energy delivery and uniform protective gas distribution, preventing oxidation and improving the quality of the welding process.
Implementation Method 1
As soon as the electrical current flows between the bolt and the substrate, the bolt is lifted from the substrate, forming an arc
Implementation Method 2
The energy released causes the material of the bolt and the substrate to partially liquefy
Implementation Method 3
The shielding gas flows past the weld with the liquefied material and displaces any oxygen present in the ambient air
Data Source
Figure 1
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Figure 5~6
AI summary
The invention relates to a welding device for welding a weld stud to an underlying surface in a welding direction along a welding axis, comprising a protective gas bell with a welding chamber and comprising a holding device for holding the weld stud within the welding chamber during a welding process. The protective gas bell has an inlet channel (355), a distributing chamber (356), a plurality of first connection channels (350), and a protection gas inlet into the welding chamber, wherein a protection gas feed line can be connected to the inlet channel (355), and the inlet channel (355) leads into the distributing chamber (356), the first connection channels (350) lead into the distributing chamber (356) at different distances to the inlet channel (355), the first connection channels (350) pneumatically connect the distributing chamber (356) to the protection gas outlet, and a common cross-sectional area of the first connection channels (356) is greater the greater the distance to the inlet channel (355) is at which the first connection channels (356) lead into the distributing chamber (356).