Welding Torch Wire Positioning for Accurate Arc Deposition
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Solution Overview
Problem
Existing metal deposition techniques in solid freeform fabrication face challenges in maintaining the accurate positioning of metal wires within the arc of a welding torch, leading to irregularities and inefficiencies in metal deposition, particularly when working with expensive materials like titanium and nickel alloys.
Innovation Solution
A metal wire positioning system that includes a fixed main support frame and an adjustable guide support frame, connected via a pivot joint and rotatable support piston, with a motor-driven threaded member to precisely reposition the metal wire relative to the heat source, ensuring continuous and accurate feeding into the molten pool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a metal wire is fed into a welding torch arc for solid freeform fabrication, then metal deposition can be achieved, but the wire positioning accuracy deteriorates leading to irregularities in deposition
Solution Approach 1:
The system employs a detector that continuously monitors the position of the metal wire relative to the welding torch arc and provides feedback signals to a control system. The control system automatically adjusts the wire feed mechanism to maintain optimal positioning, ensuring consistent deposition quality and eliminating irregularities caused by manual positioning errors.
Solution Approach 2:
The patent replaces manual mechanical wire positioning with an automated control system that uses detector feedback to electronically control wire feed mechanisms. This substitution of mechanical manual adjustment with automated control systems significantly improves positioning accuracy and deposition consistency.
2Measurement precision
If the wire positioning system is made adjustable and movable, then wire repositioning accuracy can be improved, but the device complexity increases
Solution Approach 1:
The system incorporates movable and adjustable components including a detector that can be repositioned along the welding torch and wire feed mechanisms with variable control. These dynamic elements allow precise wire repositioning while the modular design keeps the complexity manageable through standardized adjustment mechanisms.
Solution Approach 2:
The positioning system is designed with multi-functional components that serve multiple purposes. The detector system not only monitors wire position but also provides alignment reference. The adjustable support structures serve both mechanical support and positioning adjustment functions, reducing the need for separate dedicated components and thereby controlling overall system complexity.
3Measurement precision
If the detection system captures images with shorter exposure time to freeze motion, then the wire position detection accuracy improves, but the image brightness decreases
Solution Approach 1:
The detection system dynamically adjusts imaging parameters including exposure time and gain based on the detected wire motion speed and arc intensity. By changing these parameters adaptively, the system maintains sufficient image brightness while using shorter exposure times to freeze wire motion and improve position detection accuracy.
Solution Approach 2:
The system introduces an intermediary image processing step that enhances the captured images through digital amplification and noise reduction algorithms. This intermediary processing allows the use of shorter exposure times for motion freezing while compensating for the reduced light capture through computational enhancement of image brightness and quality.
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 system ensures a constant supply of melted metal to the workpiece, preventing gaps and imperfections, thereby increasing deposition rates and efficiency while minimizing material waste and maintaining the integrity of complex shapes.
Implementation Method 1
A welding torch includes a heat source, such as a plasma arc welding torch, to melt a metal wire
Implementation Method 2
The plasma stream is created by energizing a flowing gas using an arc electrode
Implementation Method 3
A motor is attached to the adjustable guide support frame, and the motor is attached to a threaded member
Data Source
Figure 1
AI summary
Provided is a method of continuously providing a metal wire (180) to a welding torch (600, 610) in the correct orientation with respect to the heat source of the welding torch (600, 610) for manufacturing objects by solid freeform fabrication to provide continuous deposition of metal to the freeform object, especially objects made with titanium or titanium alloy, or nickel or nickel alloy, wire (180).