Electric arc start systems and methods
First Claim
1. A welding system, comprising:
- a welding torch; and
a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises;
pseudo-random noise (PRN) generator control logic circuitry configured to generate a dithered pulse waveform with a pseudo-randomly selected data sequence of binary values, and to apply the dithered pulse waveform to an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch.
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Abstract
A system and methods for electrically starting an arc in a welding process are disclosed. The system and methods may reduce an electromagnetic interference (EMI) footprint during the arc start by reducing the average power spectral density output and broadening the frequency spectrum of the arc EMI footprint. In one embodiment, a welding system may include a welding torch and a welding power source electrically coupled to the welding torch via a weld cable configured to supply electrical energy to the welding torch. The welding power source may include pseudo-random noise (PRN) generator control logic circuitry configured to generate a dithered pulse waveform with a pseudo-randomly selected data sequence of binary values based on one or more baselines, and to apply the dithered pulse waveform to an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch.
79 Citations
23 Claims
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1. A welding system, comprising:
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a welding torch; and a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises; pseudo-random noise (PRN) generator control logic circuitry configured to generate a dithered pulse waveform with a pseudo-randomly selected data sequence of binary values, and to apply the dithered pulse waveform to an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A welding system, comprising:
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a welding torch; and a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises; pseudo-random noise (PRN) generator control logic circuitry configured to generate a pulse waveform with a pseudo-randomly selected data sequence of binary values, and to alter a phase of an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch based at least in part on the pulse waveform. - View Dependent Claims (9, 10, 11)
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12. A welding system, comprising:
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a welding torch; and a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises; pseudo-random noise (PRN) generator control logic circuitry configured to generate a pulse waveform with a pseudo-randomly selected data sequence of binary values, and to alter a frequency of an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch based at least in part on the pulse waveform. - View Dependent Claims (13, 14, 15)
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16. A welding system, comprising:
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a welding torch; and a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises; pseudo-random noise (PRN) generator control logic circuitry configured to generate a pulse position modulated (PPM) waveform with a pseudo-randomly selected data sequence of binary values, and to alter a phase of an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch based at least in part on the PPM waveform. - View Dependent Claims (17, 18, 19)
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20. A welding system, comprising:
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a welding torch; and a welding power source coupled to the welding torch via a weld cable configured to supply welding power to the welding torch, wherein the welding power source comprises; pseudo-random noise (PRN) generator control logic circuitry configured to generate a pulse width modulated (PWM) waveform with a pseudo-randomly selected data sequence of binary values, and to alter a phase of an oscillator during arc starting in a tungsten inert gas (TIG) welding process performed by the welding torch based at least in part on the PWM waveform. - View Dependent Claims (21, 22, 23)
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Specification