Blanket Gas Control for Electrical Welding
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Solution Overview
Problem
Existing electrical welding apparatuses lack precise control over blanket gas flow during the initial phase of welding operations, which affects the quality and efficiency of the weld, particularly in terms of gas consumption and environmental impact.
Innovation Solution
A system that includes a welding interface device generating control signals from voltage and current sensors to regulate the gas regulator, ensuring optimal blanket gas flow before and during the welding process, using separate control means for pre-welding and dynamic flow control during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If blanket gas flow is controlled only during welding operation, then gas consumption is reduced, but weld quality during initial phase deteriorates
Solution Approach 1:
The system activates the blanket gas valve before the welding current is applied to the electrode, ensuring that the welding area is already covered with protective gas when welding begins. This preliminary action prevents oxidation and contamination during the critical initial phase of welding, thereby maintaining weld quality while avoiding excessive gas consumption by not keeping gas flowing during non-welding periods.
2Manufacturing precision
If blanket gas flows continuously, then weld quality is maintained, but gas consumption increases
Solution Approach 1:
The system employs periodic control of the blanket gas valve, activating it only during specific periods: before welding starts and during the welding operation itself. The valve remains closed during non-welding periods such as electrode replacement or travel time. This periodic action maintains weld quality when needed while significantly reducing blanket gas consumption compared to continuous flow.
3Loss of substance
If blanket gas flow is reduced, then gas consumption decreases, but protective coverage deteriorates
Solution Approach 1:
The system dynamically adjusts the blanket gas flow rate based on the welding current magnitude. When welding current increases, indicating more intense welding activity, the gas flow rate automatically increases to provide adequate protective coverage. When welding current decreases or stops, gas flow reduces accordingly. This dynamic control maintains reliable protective coverage during welding while minimizing gas consumption during low-activity periods.
Data Source
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AI summary
Apparatus and method for use in controlling blanket gas flow in an electrical welding facility, wherein welding is performed using a welding electrode in electrical connection with a welding machine unit. The apparatus comprises an electric measuring device having a current sensor 3 adapted to determine the magnitude of an electrical welding current carried in a circuit incorporating the welding electrode and having a current sensor output adapted to provide a I signal indicating the current magnitude, and a voltage sensor 11 adapted to determine the magnitude of an electrical voltage being applied to the welding electrode and having a voltage sensor output for providing a U signal indicating the voltage magnitude, and a control device 6. The control device 6 has inputs connected to the current sensor output and the voltage sensor output, respectively, and a control signal output for providing a control signal to a blanket gas flow controller 7, and a controller adapted to provide the control signal as a) a control signal of a predetermined first magnitude when the U signal is larger than the first U threshold and the I signal is less than a first I threshold, and b) a control signal of a magnitude varying proportionally with the I signal when the I signal is greater than the first I threshold.