Short arc welding system
AssigneeLincoln Global, Inc.
InventorRussell K. Myers
Life of this patent
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Abstract
A welding system for performing a short arc welding process between a advancing wire electrode and a workpiece. The system comprises a power source with a controller for creating a current pulse introducing energy into the electrode to melt the end of the electrode and a low current quiescent metal transfer section following the end of the melting pulse during which the melted electrode short circuits against the workpiece; a timer to measure the actual time between the end of the pulse and the short circuit; a device for setting a desired time from the pulse to the short circuit; a circuit to create a corrective signal based upon the difference between the actual time and the desired time; and, a circuit responsive to the corrective signal to control a given parameter of the current pulse.
Claims25
A welding system for performing a short arc welding process between an advancing wire electrode and a workpiece where said electrode has an end facing said workpiece, said system comprising:
- a power source with a controller for creating a current pulse introducing energy into said end of said electrode to melt said end and a low current quiescent metal transfer section following the end of said current pulse during which said melted electrode short circuits against said workpiece, wherein said controller includes a circuit for creating a short circuit clearing pulse after said short circuit prior to a next current pulse, said clearing pulse has a first current followed by a higher second current, the current is constant for a period of time between the first current and the second current,
- a timer for measuring an actual time between the end of said current pulse and the beginning of said short circuit;
- a device for setting a desired time from the end of said current pulse to the beginning of said short circuit;
- a circuit for creating a corrective signal based upon a difference between said actual time and said desired time;
- and
- a circuit responsive to said corrective signal for controlling a given parameter of said current pulse.
A method of controlling a melting pulse of a short arc welding process where the melting pulse is followed by a low current transfer cycle, said method comprising:
- (a) measuring an actual time for a duration between the end of said melting pulse and the beginning of a short circuit during said transfer cycle;
- (b) setting a desired time for said duration;
- (c) creating a corrective signal by comparing said measured actual time and said set desired time;
- (d) adjusting a parameter of said melting pulse based upon said corrective signal;
- and
- (e) creating a short circuit clearing pulse after said short circuit prior to a next melting pulse, wherein said clearing pulse has a first current followed by a higher second current, the current is constant for a period of time between the first current and the second current.
A welding system for performing a short arc welding process by an AC waveform between an advancing wire electrode and a workpiece where said electrode has an end facing said workpiece, said system comprising:
- a power source with a controller for creating a negative current pulse introducing energy into said end of said electrode to melt said end and a low positive current quiescent metal transfer section following the end of said current pulse during which said melted electrode short circuits against said workpiece, wherein said controller includes a circuit for creating a short circuit clearing pulse after said short circuit prior to a next current pulse, said clearing pulse has a first current followed by a higher second current, the current is constant for a period of time between the first current and the second current,
- a timer for measuring an actual time between the end of said current pulse and the beginning of said short circuit;
- a device for setting a desired time from the end of said current pulse to the beginning of said short circuit;
- a circuit for creating a corrective signal based upon a difference between said actual time and said desired time;
- and
- a circuit responsive to said corrective signal for controlling total energy of said current pulse.
Dependencies are inferred from the claim text.