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US 11,110,536 B2Granted
Apparatus and method for welding with AC waveform
AssigneeLincoln Global, Inc.
InventorsDaniel Fleming, Judah Henry
Life of this patent
Estimating the term…
Abstract
A welding system is provided which utilizes a short arc welding method in which the waveforms have a positive polarity portion and negative portion to optimize heat input and provide heat and current control.
Claims19
A welding system, comprising:
- a welding power converter configured to receive an input power and output a plurality of welding waveforms to a welding electrode for a welding operation on a workpiece;
- a short circuit detection circuit which detects a short circuit event between said electrode and said workpiece, and
- a variable polarity circuit which changes the polarity of portions of said welding waveforms during said welding operation,
- wherein each waveform of said plurality of welding waveforms comprises:
- a background portion with a first polarity and a background current level;
- a low current portion with said first polarity which is initiated after said short circuit detection circuit detects the short circuit event and is maintained for a first duration and has a second current level which is lower than said background current level;
- a pinch current portion with said first polarity which has a first peak current level and which follows said low current portion after said first duration;
- a separation current portion with said first polarity which follows said pinch current portion, where said separation current portion has a separation current level that is lower than said first peak current level;
- a stabilization current portion with said first polarity which follows said separation current portion, wherein said stabilization current portion is maintained for a predetermined second duration;
- a plasma boost pulse with a second polarity that follows said stabilization current portion;
- and
- a current tailout portion with said second polarity and which follows said plasma boost pulse.
9 more elements
A welding system, comprising:
- a welding power converter configured to receive an input power and output a plurality of welding waveforms to a welding electrode for a welding operation on a workpiece;
- a short circuit detection circuit which detects a short circuit event between said electrode and said workpiece, and
- a variable polarity circuit which changes the polarity of portions of said welding waveforms during said welding operation,
- wherein each waveform of said plurality of welding waveforms comprises:
- a background portion with a positive polarity and a background current level;
- a low current portion with said positive polarity which is initiated after said short circuit detection circuit detects the short circuit event and is maintained for a first duration and has a second current level which is lower than said background current level;
- a pinch current portion with said positive polarity which has a first peak current level and which follows said low current portion after said first duration;
- a separation current portion with said positive polarity which follows said pinch current portion, where said separation current portion has a separation current level that is lower than said first peak current level;
- a stabilization current portion with said positive polarity which follows said separation current portion, wherein said stabilization current portion is maintained for a second duration which is predetermined based on a type of the welding electrode;
- a plasma boost pulse with a negative polarity that immediately follows said stabilization current portion;
- and
- a current tailout portion with said negative polarity and which follows said plasma boost pulse.
9 more elements
Dependencies are inferred from the claim text.