Arc Welding Torch Nozzle with Coaxial Fume Extraction
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Solution Overview
Problem
Existing arc welding torches with integrated extraction systems face limitations in handling due to the restriction caused by the extraction device attached to the torch head, and the routing of flue gas via a bypass pipe severely limits the extracted volume flow.
Innovation Solution
A combined extraction/shielding gas nozzle with an integral extraction device attached to the torch handle, where the flue gas is directed through the torch body and handle, eliminating the need for a bypass line, and featuring a coaxial extraction channel surrounding the shielding gas channel, allowing for a compact and safe design with reduced weight and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the extraction device is attached to the torch head with a bypass pipe routing, then flue gas can be extracted from the welding zone, but the handling flexibility is restricted and the extracted volume flow is severely limited
Solution Approach 1:
The patent merges the extraction device with the torch handle instead of attaching it to the torch head. The extraction channel is integrated into the handle structure, allowing the extraction opening to be positioned on the torch neck while the extraction device itself resides in the handle. This integration eliminates the bypass pipe routing constraint and significantly improves both handling flexibility and extracted volume flow capacity.
2Object-generated harmful factors
If the extraction device is integrated into the torch head, then flue gas extraction is achieved, but the device complexity and component count increase
Solution Approach 1:
The patent segments the extraction system by separating the extraction opening (positioned on the torch neck for effective flue gas capture) from the extraction device (integrated into the handle). This segmentation allows the extraction function to be achieved while maintaining a cleaner, more manageable torch head design and reducing overall device complexity.
Solution Approach 2:
The torch handle is designed to serve multiple functions: it houses the extraction device, provides structural support, and enables ergonomic operation. By integrating the extraction device into the handle, the system achieves flue gas extraction capability without adding separate dedicated components, thereby reducing overall device complexity.
3Productivity
If the extraction channel is positioned to maximize flue gas capture, then extraction efficiency improves, but the shielding gas flow may be affected
Solution Approach 1:
The patent positions the extraction opening on the torch neck in a location and orientation that captures flue gas effectively without interfering with the shielding gas flow path. The extraction channel is configured to draw flue gas laterally, creating a three-dimensional separation between the shielding gas flow (moving forward to protect the weld zone) and the extraction flow (drawing flue gas toward the handle). This spatial arrangement in multiple dimensions ensures both high extraction efficiency and stable shielding gas flow.
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 handling flexibility, ensures safe operation by integrating the extraction device with the shielding gas channel, reduces component complexity, and improves flue gas extraction efficiency by routing it away from the shielding gas flow, minimizing heating and allowing for interchangeable nozzle lengths.
Implementation Method 1
a shielding gas channel (1) for supplying shielding gas to the welding process
Implementation Method 2
an extraction device (3), connected integrally to the shielding gas channel (1), for extracting the flue gas produced during the welding process
Implementation Method 3
Arc welding devices generate an arc between the workpiece and a consumable or non-consumable welding electrode to melt the weld metal
Implementation Method 4
The arc energy input, high-energy thermal radiation and convection result in significant heat input to the torch head
Implementation Method 5
the torch head is actively cooled with a coolant which flows through the torch head and thereby removes the unwanted heat absorbed from the welding process
Data Source
AI summary
A combined extraction/shielding gas nozzle of an arc welding torch with a non-consumable electrode, such as a TIG or plasma torch, is attached to a torch body and has a shielding gas channel for supplying shielding gas to the welding process, and has an extraction device connected integrally to the shielding gas channel, for extracting the flue gas produced during the welding process. The flue gas discharge is arranged via the torch head and a guide on the torch body into the handle, rather than via a separate bypass line The flue gas is directed from the nozzle on the torch head through the torch body of the nozzle to the handle of the welding torch.