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This article describes the characteristics and technology of power sources for major arc welding methods along with the suggested criteria for assuring that a power source selection can safely deliver the desired output and yield long service life. Power sources with single-phase AC input voltage, three-phase input machines, inverter-based power sources, short arc gas metal arc welding power sources, and multiple arc power sources are discussed. The article also presents the factors to be considered when selecting a power source.

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