Controlled Short-Circuit MIG Welding for Stable Arc and Low Spatter
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Solution Overview
Problem
Pulsed and short circuit welding regimes in MIG welding often result in limitations such as reduced travel speed, excessive spatter, less than optimal penetration, and energy inefficiencies, particularly with cored wire electrodes where the arc tends to flare due to excessive current flow through the wire sheath.
Innovation Solution
A welding method that generates a control waveform with successive peak phases followed by controlled short circuits between the welding wire and the weld puddle, regulating each peak phase based on the immediately preceding short circuit to optimize short circuit occurrence and duration, thereby controlling energy input and arc stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pulsed and short circuit welding regimes are used, then weld quality and control are improved, but travel speed is limited and spatter increases
Solution Approach 1:
The patent applies periodic action by using a pulsed welding current regime with distinct peak and valley phases. The current is periodically increased to peak levels to promote controlled short circuits and then reduced to valley levels to allow arc recovery, creating a cyclic welding process that improves weld quality while managing travel speed limitations.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting current amplitude and pulse frequency during welding. By varying these electrical parameters, the system optimizes the balance between achieving controlled short circuits for quality welds and maintaining adequate travel speed for productivity.
2Speed
If short circuit welding is used, then penetration and travel speed are improved, but spatter and energy inefficiency increase
Solution Approach 1:
The periodic pulsed current regime allows the arc to be periodically reinforced during peak phases for improved penetration and travel speed, while the valley phases provide energy recovery periods that reduce overall energy consumption and minimize spatter generation.
3Reliability
If excessive current is applied to cored wire electrodes, then short circuit clearing is improved, but arc flaring occurs due to sheath melting
Solution Approach 1:
The patent applies dynamics by making the current amplitude dynamic rather than constant. The current varies between peak and valley levels, allowing high current during peaks to clear short circuits effectively while using lower current during valleys to prevent excessive heating and melting of the wire sheath, thus maintaining arc stability.
Solution Approach 2:
The periodic pulsed current regime provides intermittent high current to clear short circuits when needed, followed by recovery periods at lower current levels that prevent cumulative heating of the wire sheath, thereby preventing arc flaring while maintaining reliable short circuit clearing.
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 enhances weld quality and flexibility by maintaining arc length, reducing spatter, and minimizing energy addition to the weld and electrode, allowing for faster travel speeds while maintaining a stable arc.
Implementation Method 1
Electrical power is applied to the welding wire and a circuit is completed through the workpiece to sustain an arc that melts the wire and the workpiece to form the desired weld
Implementation Method 2
sustain an arc that melts the wire and the workpiece
Implementation Method 3
control short circuits between the wire and the weld puddle comprising of melted metal of the workpieces and the wire electrode
Data Source
AI summary
A welding system and method provide for generating a controlled waveform for welding power output, the waveform comprising a plurality of successive peak phases followed by a short circuit between a welding wire electrode and an advancing weld puddle. Each then present peak phase is regulated based upon at least the immediately preceding short circuit to control the short circuit that will occur following the then present peak phase. Some embodiments permit regulating at least one waveform phase based upon at least the immediately preceding short circuit to control the next short circuit that will occur, and regulating at least one short response phase based upon at least the immediately preceding short circuit to control the next short circuit that will occur.