Harmonic Welding Wire Reciprocation for High-Speed Torch Feeding
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Solution Overview
Problem
Conventional reciprocating wire feed systems in welding are limited by high torque requirements, overheating, and oversized components, which restrict wire feed and travel speeds, and reduce weld joint accessibility.
Innovation Solution
A harmonic wire reciprocation system that uses the welding wire as a spring and a force actuator mass as a resonator to oscillate the wire at the tip of the welding torch, with a wire guide and actuator configured to apply force within a clearance zone, allowing for adjustable oscillation frequency and increased reliability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional bi-directional motors are used for wire reciprocation, then wire feed and travel speeds can be achieved, but high torque requirements cause overheating and limit reciprocating frequency
Solution Approach 1:
The patent uses a harmonic drive mechanism that generates controlled mechanical vibrations to reciprocate the welding wire. The system employs a cam mechanism with eccentric rotation to create oscillating motion in the wire feed, transforming continuous motor rotation into reciprocating wire movement. This vibration-based approach reduces the torque burden on the motor compared to direct bi-directional driving.
Solution Approach 2:
The patent implements periodic reciprocating action of the welding wire through a cam mechanism driven by continuous rotation. The cam profile is designed to create controlled forward and reverse movements of the wire at specific frequency intervals. This periodic reciprocation enables controlled short-circuit events while maintaining continuous welding progression, resolving the contradiction between speed and reliability.
2Ease of operation
If conventional reciprocating wire feed systems are used, then wire oscillation can be achieved, but oversized components reduce weld joint accessibility
Solution Approach 1:
The patent integrates the harmonic drive mechanism and cam components within the existing torch structure. The cam mechanism is positioned inside the torch body, with the eccentric rotation occurring within the torch housing. The wire reciprocation is achieved through internal mechanical arrangements that do not increase the external dimensions of the torch, maintaining accessibility to confined weld joints.
Solution Approach 2:
The patent uses a dynamically balanced cam mechanism that creates wire oscillation through controlled mechanical motion. The eccentric cam converts continuous rotational motion into reciprocating wire movement with variable amplitude and frequency. This dynamic approach enables wire oscillation capability without requiring oversized static components, keeping the torch compact for better joint accessibility.
3Speed
If high torque motors are used for wire reciprocation, then wire feed speeds can be maintained, but system complexity and cost increase
Solution Approach 1:
The patent replaces the need for complex bi-directional motor control with a simpler continuous rotation motor coupled with a mechanical cam mechanism. Instead of using electronic controls to reverse motor direction at high speeds, the system uses the cam's physical geometry to automatically convert continuous rotation into reciprocating wire motion. This mechanical substitution reduces both motor complexity and control system complexity while maintaining wire feed speed capability.
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 approach enables higher deposition rates and faster welding speeds while reducing the need for high-torque motors, improving reliability and accessibility, and allowing for more efficient control of short circuit events during welding.
Implementation Method 1
A harmonic wire reciprocation system that uses the welding wire as a spring and a force actuator mass as a resonator to oscillate the wire at the tip of the welding torch
Data Source
AI summary
A harmonic welding wire oscillator configured to oscillate a stretch of welding wire within a wire liner. The oscillator may include an actuator configured to oscillate the welding wire at a resonant frequency of the stretch of welding wire. The oscillation causes reciprocation of the welding wire at the tip of the welding torch.