Welding Gun Wire Feed Control for Spatter Reduction
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Solution Overview
Problem
Existing arc welding processes face challenges in reducing spatter during arc formation and transition from short circuit to arc state, particularly in low-cost manual and open arc welding applications, where prior control schemes are complex and not effectively suited.
Innovation Solution
A welding gun with a wire path lined by a solenoid or motor system that can reverse, slow, or stop the wire feeding in response to sensed welding output parameters, such as voltage or current thresholds, to control the arc formation and transition, thereby reducing spatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wire is fed continuously during arc formation, then welding process continues without interruption, but spatter is generated due to resistive heating and arc formation in the middle of wire bridge
Solution Approach 1:
The solenoid applies a restraining force to the wire feed mechanism before the short circuit condition fully develops, preventing the wire from bridging to the workpiece and forming a short. This preliminary counter-action stops the harmful process before it generates spatter, while allowing continuous welding operation by quickly releasing the restraint when appropriate.
Solution Approach 2:
The control circuit monitors welding parameters (voltage, current) and provides feedback to the solenoid to activate or deactivate based on the welding state. When a short circuit condition is detected, the feedback signal triggers the solenoid to restrain wire feed; when the condition clears, the feedback signal releases the restraint, maintaining continuous welding without spatter.
2Ease of operation
If high current is applied to pinch off droplet during transition from short circuit to arc, then welding process transitions, but violent disintegration of molten metal bridge produces excessive spatter
Solution Approach 1:
The solenoid restrains wire feed before the short circuit transitions to arc, preventing excessive wire accumulation that would require high pinching current. By controlling wire position in advance, the system avoids the need for violent high-current droplet detachment, thereby reducing spatter during the critical transition phase.
Solution Approach 2:
The system prepares for the transition by actively managing wire feed position through solenoid control. Before the transition occurs, the wire is positioned optimally so that when arc formation begins, the current can be applied more gradually and evenly, preventing violent disintegration and reducing spatter.
3Reliability
If complex control schemes are used to stabilize short circuit welding, then welding stability improves, but device complexity increases
Solution Approach 1:
The invention extracts the essential control function from complex multi-parameter schemes and isolates it to a single key mechanism: solenoid-controlled wire feed restraint. By focusing on controlling wire position rather than managing multiple welding parameters simultaneously, the system achieves stability with minimal complexity.
Solution Approach 2:
The control circuit uses the welding process itself (voltage, current measurements) to automatically control the solenoid, which in turn controls wire feed. The system self-regulates based on its own operating conditions without requiring external complex control schemes, achieving stability through simple feedback from the welding parameters themselves.
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 solution effectively reduces spatter by controlling the wire feeding mechanism during arc starts and short circuit transitions, improving the stability and efficiency of the welding process across various welding applications.
Implementation Method 1
A solenoid has an activated position that impinges on the wire path, and a deactivated position that does not impinge on the wire path
Implementation Method 2
A motor, electromagnetic brake, or particle brake, connected to a roller, that, when activated, resists, slows, stops or reverses the wire feeding
Implementation Method 3
A motor, electromagnetic brake, or particle brake, connected to a roller, that, when activated, resists, slows, stops or reverses the wire feeding
Implementation Method 4
resistive heating melts or softens wire and creates an arc in the middle of the wire bridge
Implementation Method 5
the arc is formed, such as at the beginning of a weld (particularly for a touch start) or when transitioning from a short circuit to an arc during the weld
Data Source
AI summary
A method and apparatus for reducing spatter is disclosed. A welding gun, which can be an integrated part of a welding system, includes a device, such as a solenoid or motor and roller, to slow, stop or reverse the wire. The device is activated in response to feedback indicative of a short, a short that is about to form, or the imminent clearing of a short. The detection of the short, forming of a short, or clearing of a short is in response to feedback based on current and/or voltage. Output current can also be reduced.