MIG/MAG Welding Power Supply Synchronized Arc State Switching
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Solution Overview
Problem
Existing MIG/MAG welding methods experience uncontrolled material transfer and unsatisfactory welding behavior due to unsynchronized transitions between arc operating states, specifically between pulsed and short arc states.
Innovation Solution
Implementing a method where the transition between arc operating states is synchronized with the point of material transfer, using detector means to ensure controlled switching, and incorporating presettable dead times and programmable duration ratios to optimize energy input based on wire feed speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transition between arc operating states is performed at fixed time intervals, then the welding process can be simplified and operated continuously, but the material transfer becomes uncontrolled and welding behavior deteriorates
Solution Approach 1:
The patent employs feedback control by detecting the actual material transfer moment through voltage drop detection during short-circuit welding. The system monitors the welding process in real-time and triggers state transitions based on detected material transfer events rather than fixed timers, ensuring precise control of material transfer while maintaining continuous operation
Solution Approach 2:
The system performs preliminary detection of the material transfer moment by monitoring voltage changes before actually switching states. This allows the control system to prepare for the state transition in advance, ensuring that the switch occurs at the optimal moment for controlled material transfer
2Manufacturing precision
If the transition between arc operating states is synchronized with material transfer, then material transfer control improves, but the device complexity increases due to detector means
Solution Approach 1:
The welding process itself provides the detection signal through natural voltage drops during short-circuit material transfer. The system uses the inherent electrical characteristics of the welding process to detect material transfer moments, eliminating the need for separate complex detection sensors or additional hardware components
Solution Approach 2:
The control system acts as an intermediary that translates the natural voltage drop signals during short-circuit welding into state transition commands. This intermediary function allows the system to use simple voltage monitoring to achieve precise material transfer control without requiring complex direct detection mechanisms
3Strength
If pulsed arc state is used to increase heat input and penetration, then welding depth improves, but the process temperature increases which may be undesirable for thin materials
Solution Approach 1:
The patent employs periodic alternation between pulsed arc state (for heat input and penetration) and short arc state (for cooling). This periodic switching allows the system to accumulate necessary heat for adequate penetration while periodically reducing heat input to control overall process temperature and prevent overheating of thin materials
Solution Approach 2:
The welding process is segmented into distinct phases (pulsed arc phase and short arc phase), each serving a specific function. The pulsed arc phase provides concentrated heat for penetration, while the short arc phase provides cooling, allowing independent optimization of heat input and temperature control
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 ensures controlled material transition, improving welding behavior by synchronizing state changes with material transfer events and allowing for adaptable energy input, enhancing the welding process for various materials and conditions.
Implementation Method 1
the transition from the current to the subsequent operating state of the arc takes place synchronized with a point in time at which the material is transferred in the current operating state. The synchronized transition from the short arc to the pulsed arc always occurs immediately after the material transition in the short circuit during the short arc phase. The transition is thus detected by the detector means by resolving the short circuit.
Implementation Method 2
Due to the so-called pinch effect, i.e. under the influence of the Lorenz force, which represents a radially inward directed force resulting from the surrounding magnetic field, the molten end of the electrode is constricted and individual drops are detached from it
Data Source
Figure 1~2
Figure 3
AI summary
A metal gas arc welding method comprises a phase in a first arc operating state for a given time (ts1) followed by a phase in a second operating state for a further given time (ts2) with the process being switched alternately between the two operating modes. Switching is synchronized with a time point of the material process in the actual operating conditions. Preferably the first mode is a short arc condition and the second an impulse arc condition. An independent claim is also included for a device for the above method.