Welding Power Limiting for Stable Arc Control Under Supply Fluctuations
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Solution Overview
Problem
Welding devices face instability due to fluctuations in supply voltage, leading to potential break-off of the welding arc, as they often attempt to regulate welding power beyond what can be delivered, especially with long supply lines or generators as energy sources.
Innovation Solution
A method and device that calculate the maximum supply power from the energy source's voltage and current, limiting the welding power to prevent excessive regulation, using a calculation unit to determine the maximum welding power and a limiting unit to restrict the welding current, ensuring stable operation by preventing the welding arc from breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the welding device attempts to regulate welding power beyond the maximum deliverable power, then the welding power regulation capability is improved, but the welding arc stability deteriorates leading to break-off
Solution Approach 1:
The control unit continuously monitors the supply voltage and calculates the maximum deliverable power in real-time. Based on this feedback, the system dynamically adjusts the welding power regulation to stay within the calculated limits, preventing arc break-off while maintaining adaptability.
Solution Approach 2:
The system transitions from static power regulation to dynamic power regulation by continuously calculating the maximum deliverable power based on real-time supply voltage measurements. This allows the welding device to adapt its power output dynamically to match the actual energy source capabilities.
2Adaptability or versatility
If the supply voltage fluctuates due to long supply lines or generators, then the energy source versatility is improved, but the welding power delivery capability deteriorates
Solution Approach 1:
The system changes the operating parameters by measuring the actual supply voltage and calculating the maximum deliverable power based on this measured parameter. This allows the system to adapt to different energy sources (grid, generator, long supply lines) by adjusting the power delivery capability according to the actual voltage conditions.
3Reliability
If the welding device calculates and limits welding power based on maximum supply power, then the welding process stability is improved, but the device complexity increases due to additional calculation and limiting units
Solution Approach 1:
The control unit performs multiple functions: it measures supply voltage, calculates maximum deliverable power, regulates welding power, and prevents overcurrent. By consolidating these functions into a single control unit, the patent minimizes additional complexity while achieving improved welding process stability.
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 prevents undesired termination of the welding process by maintaining the welding arc stability, even with fluctuations in supply voltage, by limiting the welding power based on the maximum supply power, thus ensuring a stable welding process.
Implementation Method 1
the welding device is supplied with a supply power by an energy source and converts at least a part of the supply power into a welding power in order to generate a welding arc
Implementation Method 2
A welding device generates a welding voltage and a welding current at an electrode during a welding process, i.e., during the ignition and burning of a welding arc. The welding device delivers a welding power through the welding arc, wherein the welding power in turn is the product of the welding voltage and the welding current.
Data Source
AI summary
The aim of the invention is to enable a stable welding process. This is achieved in that a welding device is supplied with a supply power by an energy source and converts at least a part of the supply power into a welding power in order to generate a welding arc, wherein the welding power is regulated by specifying a welding current. For this purpose, the supply voltage is determined, and the maximum supply current that can be delivered to the welding device from the energy source is specified. A maximum supply power is calculated using the supply voltage and the maximum supply current. The maximum welding power that is delivered by the welding device is determined from the maximum supply power, and the welding power is limited to the maximum welding power that can be delivered.